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1Formulas and methods
Time value of money
Future value
FV = PV·(1 + i)n
Present value
PV = FV/(1 + i)n
Several periods per year
i = r/m, N = m·n
Annuity, present value
PV = PMT·[1 − (1 + i)−n]/i
Annuity, future value
FV = PMT·[(1 + i)n − 1]/i
Method
Draw a timeline with every cash flow and its timing.
Match the rate to the period: a monthly rate for monthly payments.
Use FV = PV·(1 + i)ⁿ for single amounts and the annuity formulas for equal payments.
Check the sign and the order of magnitude of the answer.
Bond pricing & yield
Bond price
P = C·(1 − (1 + y)−n)/y + F/(1 + y)n
Semi-annual
C/2, y/2 and 2n periods
Current yield
C/P
Price and yield
yield up → price down
Method
Find the coupon per period and the yield per period.
Price = present value of the coupons (an annuity) + present value of the face value.
For semi-annual coupons use half the coupon, half the yield and twice the periods.
Check: if the yield is above the coupon rate, the price is below face value.
CAPM & WACC
CAPM
re = rf + β·(rm − rf)
WACC
E/V·re + D/V·rd·(1 − T)
Firm value
V = E + D
NPV & IRR
Net present value
NPV = −C0 + Σ CFt/(1 + r)t
Equal cash flows
NPV = −C0 + CF·[1 − (1 + r)−n]/r
Internal rate of return
the r at which NPV = 0
Decision
accept when NPV > 0 (or IRR > required return)
Method
List all cash flows with their year; the investment at year 0 is negative.
Discount each cash flow: CFt/(1 + r)t.
Add them up to get the NPV. Positive means the project earns more than r.
For the IRR, find the rate that makes NPV zero by trial or interpolation.
2Practice problems
1.Time value of moneyMedium
An annuity pays €5 000 at the end of each year for 17 years. The interest rate is 5% per year. Find the present value PV of the annuity.
A = €5 000i = 5%n = 17
PV = €
2.Time value of moneyHard
You want €100 000 in 9 years. You save the same amount at the end of every month in an account paying 2.4% per year, compounded monthly. Find the monthly deposit A.
FV = €100 0002.4% / 12N = 108
A = €
3.Bond pricing & yieldMedium
A bond with a face value of €1 000 pays a 2% annual coupon in two half-yearly payments and matures in 10 years. The yield to maturity is 2.5% per year. Find the price P of the bond.
F = €1 000coupon = 2%YTM = 2.5%n = 10
P = €
4.Bond pricing & yieldHard
A bond with 12 years to maturity (face value €1 000, annual coupon 8%) sells for €1 168. The issuer can call it in 4 years at a call price of €1 080. Find the yield to call YTC in percent.
F = €1 000coupon = 8%P = €1 168call price = €1 080call in 4 years
YTC = %
5.CAPM & WACCMedium
A share with a beta of 0.8 has a required return of 5.2%. The risk-free rate is 2%. What expected market return rm does CAPM imply?
β = 0.8re = 5.2%rf = 2%
rm = %
6.CAPM & WACCHard
A company has 1 000 000 shares at €29.00 each and 40 000 bonds trading at €1 050 each. The pre-tax cost of debt is 4% and the tax rate is 25.8%. The share’s beta is 1.1, the risk-free rate 2.5% and the market return 9.5%. Find the WACC.
β = 1.1rf = 2.5%rm = 9.5%rd = 4%T = 25.8%
WACC = %
7.NPV & IRRMedium
A project costs €500 000 today. It generates €59 000 at the end of the first year, and the cash flow then grows by 2% per year forever. The cost of capital is 11%. Find the net present value NPV.
C0 = €500 000CF1 = €59 000g = 2%r = 11%
NPV = €
8.NPV & IRRHard
A project costs €50 000 and returns €33 000, €17 500, €29 500 at the end of years 1 to 3. Find its internal rate of return IRR in percent.
CF0 = −50 000CF1 = 33 000CF2 = 17 500CF3 = 29 500
IRR = %
3Solutions
1.Time value of money
Answer: PV = 56370 €
Time value of money: money today is worth more than the same amount later, because it can earn interest. With interest rate i per period, an amount grows as FV = PV·(1 + i)n. A series of equal payments (an annuity) is valued by adding up each payment, which gives the annuity formulas.
Annuity factor
(1 − (1 + i)−n)/i = (1 − 0.4363)/0.05 = 11.27
Present value
PV = 5 000·11.27 = €56 370.33
Answer
PV = €56 370.33
2.Time value of money
Answer: A = 830.4 €
Time value of money: money today is worth more than the same amount later, because it can earn interest. With interest rate i per period, an amount grows as FV = PV·(1 + i)n. A series of equal payments (an annuity) is valued by adding up each payment, which gives the annuity formulas.
Bond pricing: a bond’s price is the present value of its cash flows, discounted at the yield to maturity (YTM): the coupons form an annuity and the face value is paid back at maturity. P = C·(1 − (1 + y)⁻ⁿ)/y + F/(1 + y)ⁿ. When the yield is above the coupon rate the bond trades below face value, and the other way round.
Per period
C = €10.00, i = 0.0125, N = 20
Present value of the coupons
€10.00·(1 − 0.78)/0.0125 = €175.99
Present value of the face value
€1 000·0.78 = €780.01
Price
P = €956.00
Answer
P = €956.00
The yield is above the coupon rate, so the bond sells at a discount.
4.Bond pricing & yield
Answer: YTC = 5.104 %
Bond pricing: a bond’s price is the present value of its cash flows, discounted at the yield to maturity (YTM): the coupons form an annuity and the face value is paid back at maturity. P = C·(1 − (1 + y)⁻ⁿ)/y + F/(1 + y)ⁿ. When the yield is above the coupon rate the bond trades below face value, and the other way round.
Equation for the yield
1168 = 80·(1 − (1 + y)−4)/y + 1080/(1 + y)4
Solve numerically
y = 5%: €1 172.19
y = 6%: €1 132.67
YTC = 5.104%
Answer
YTC = 5.104%
The yield to maturity is 5.997%. Investors in a premium bond expect it to be called, so the lower yield to call is the more realistic one.
5.CAPM & WACC
Answer: rm = 6 %
Cost of capital: CAPM gives the return shareholders require: re = rf + β·(rm − rf). The weighted average cost of capital mixes equity and debt by their market values: WACC = E/V·re + D/V·rd·(1 − T), with V = E + D. Interest is tax-deductible, hence the (1 − T).
Market risk premium
rm − rf = (5.2% − 2%)/0.8 = 4%
Market return
rm = 2% + 4% = 6%
Answer
rm = 6%
6.CAPM & WACC
Answer: WACC = 5.922 %
Cost of capital: CAPM gives the return shareholders require: re = rf + β·(rm − rf). The weighted average cost of capital mixes equity and debt by their market values: WACC = E/V·re + D/V·rd·(1 − T), with V = E + D. Interest is tax-deductible, hence the (1 − T).
Net present value: discount every cash flow back to today with the required rate of return r, then add them up: NPV = Σ CFₜ/(1 + r)ᵗ. A project with NPV > 0 earns more than r and adds value. The internal rate of return (IRR) is the rate at which NPV = 0.
Value of the cash flows
PV = 59 000/(0.11 − 0.02) = 655 555.56
NPV
NPV = 655 555.56 − 500 000 = €155 555.56
Answer
NPV = €155 555.56
NPV is positive, so the project earns more than the required return.
8.NPV & IRR
Answer: IRR = 28.77 %
Net present value: discount every cash flow back to today with the required rate of return r, then add them up: NPV = Σ CFₜ/(1 + r)ᵗ. A project with NPV > 0 earns more than r and adds value. The internal rate of return (IRR) is the rate at which NPV = 0.
Bracket the IRR
NPV falls as the rate rises, so the IRR lies between a rate with positive NPV and one with negative NPV.
NPV(25%) = 2 704.00
NPV(30%) = −832.95
Narrow down
Linear interpolation gives a first estimate; repeating it (or a calculator's IRR function) gives the exact rate.