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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
You invest €1 000 at 3% per year with continuous compounding. Find the value FV after 2 years.
PV = €1 000r = 3%t = 2
FV = €
2.Time value of moneyHard
You want €30 000 in 16 years. You save the same amount at the end of every month in an account paying 3% per year, compounded monthly. Find the monthly deposit A.
FV = €30 0003% / 12N = 192
A = €
3.Bond pricing & yieldMedium
A bond with a face value of €1 000 pays a 3% annual coupon in two half-yearly payments and matures in 10 years. The yield to maturity is 8% per year. Find the price P of the bond.
F = €1 000coupon = 3%YTM = 8%n = 10
P = €
4.Bond pricing & yieldHard
A bond with 14 years to maturity (face value €1 000, annual coupon 9%) sells for €1 127. The issuer can call it in 6 years at a call price of €1 090. Find the yield to call YTC in percent.
F = €1 000coupon = 9%P = €1 127call price = €1 090call in 6 years
YTC = %
5.CAPM & WACCMedium
A share with a beta of 0.6 has a required return of 8.2%. The risk-free rate is 4%. What expected market return rm does CAPM imply?
β = 0.6re = 8.2%rf = 4%
rm = %
6.CAPM & WACCHard
A company has equity with a market value of €8 000 000 and a cost of equity of 14%. Its debt consists of 4 000 bonds (face value €1 000, annual coupon 4%, 8 years to maturity) that trade at €1 070 each. The tax rate is 28%. Find the WACC, using the yield to maturity of the bonds as the pre-tax cost of debt.
A machine costs €50 000 today. It generates €8 000 at the end of each year for 7 years and can then be sold for €7 500. The cost of capital is 10%. Find the net present value NPV.
C0 = €50 000CF = €8 000S = €7 500n = 7r = 10%
NPV = €
8.NPV & IRRHard
A project costs €20 000 and returns €10 500, €11 000, €7 500 at the end of years 1 to 3. Find its internal rate of return IRR in percent.
CF0 = −20 000CF1 = 10 500CF2 = 11 000CF3 = 7 500
IRR = %
3Solutions
1.Time value of money
Answer: FV = 1062 €
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.
Exponent
r·t = 0.03·2 = 0.06
e0.06 = 1.062
Future value
FV = 1 000·1.062 = €1 061.84
Answer
FV = €1 061.84
2.Time value of money
Answer: A = 121.9 €
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 = €15.00, i = 0.04, N = 20
Present value of the coupons
€15.00·(1 − 0.4564)/0.04 = €203.85
Present value of the face value
€1 000·0.4564 = €456.39
Price
P = €660.24
Answer
P = €660.24
The yield is above the coupon rate, so the bond sells at a discount.
4.Bond pricing & yield
Answer: YTC = 7.533 %
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
1127 = 90·(1 − (1 + y)−6)/y + 1090/(1 + y)6
Solve numerically
y = 7%: €1 155.30
y = 8%: €1 102.94
YTC = 7.533%
Answer
YTC = 7.533%
The yield to maturity is 7.504%. 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 = 11 %
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 = (8.2% − 4%)/0.6 = 7%
Market return
rm = 4% + 7% = 11%
Answer
rm = 11%
6.CAPM & WACC
Answer: WACC = 9.874 %
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.
Present value of the yearly cash flows
8 000·4.868 = 38 947.35
Present value of the salvage value
7 500/1.949 = 3 848.69
NPV
NPV = −50 000 + 38 947.35 + 3 848.69 = −€7 203.96
Answer
NPV = −€7 203.96
8.NPV & IRR
Answer: IRR = 22.44 %
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(20%) = 729.17
NPV(25%) = −720.00
Narrow down
Linear interpolation gives a first estimate; repeating it (or a calculator's IRR function) gives the exact rate.