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Risk and return practice problems
Prepared by Pamela Peterson-Drake
Types of risk
- Distinguish between sales risk and operating risk. Can firm have a high degree of sales risk and a low degree of operating risk? Explain.
Sales risk is the uncertainty regarding the number of units sold and the price per unit. This risk is affected by economic and market conditions. Operating risk is the uncertainty in operating earnings arising from the mix of variable and fixed operating costs. A firm can have a great deal of sales risk (e.g., a very competitive industry) and yet have low operating risk because of their operating cost structure.
- Consider two bonds. Bond A has a face value of $1,000 and a coupon rate of 10%. Bond B has a face value of $1,000 and a coupon rate of 5%. Both bonds have the same maturity. Which bond has the greater interest rate risk?
Bond B because it has the lower coupon rate.
- Consider two bonds. Bond C has a face value of $1,000 and five years remaining to maturity. Bond D has a face value of $1,000 and ten years remaining to maturity. Both bonds have the same coupon rate of 10%. Which bond has the greater interest rate risk? Bond D because it has the longer maturity.
- Consider the Gum Company. Gum sells packs of gum for $0.50 each. It costs $0.20 per pack to manufacture and distribute the gum. Gum has fixed operating costs of $5,000 and fixed financing costs of $3,000. a. What is Gum's degree of operating leverage at 50,000 packs produced and sold?
DOL = (50,000 ($0.50-0.20))/(50,000 ($0.50-0.20) - 5,000) = 1.
b. What is Gum's degree of financial leverage at 50,000 packs produced and sold? DFL = ((50,000 ($0.50-0.20) - 5,000)/(50,000 ($0.50-0.20) - 5,000 - 3,000) = 1. c. What is Gum's degree of total leverage at 50,000 packs produced and sold?
DTL = 1.5 x 1.42857 = 2.
Risk measurement
- For each of the following probability distributions, calculate the expected value and standard deviation:
a. Outcome Probability Outcome value px x-E(x) (x-E(x))^2 p(x-E(x))^2 Good 30% $40 $12 $16 $256 77 Normal 50% $20 $10 -$4 $16 8 Bad 20 % $10 $2 -$14 $196 39 100% E(x) = $24 variance = 124 standard deviation = $
b. Outcome Probability Outcome value px x-E(x) (x-E(x))^2 p(x-E(x))^2 Pessimistic 10% $1,000,000 $100,000 -$3,700,000 $13,690,000,000,000 1,369,000,000, Moderate 40% $4,000,000 $1,600,000 -$700,000 $490,000,000,000 196,000,000, Optimistic 50 % $6,000,000 $3,000,000 $1,300,000 $1,690,000,000,000 845,000,000, 100% E(x) = $4,700,000 variance = 2,410,000,000, standard deviation = $1,552,
c. Outcome Probability Outcome value px x-E(x) (x-E(x)) 2 p(x-E(x)) 2 One 10% 60% 0.060000 0.320000 0.102400 0. Two 50% 40% 0.200000 0.120000 0.014400 0. Three 30% 20% 0.060000 -0.080000 0.006400 0. Four 10% -40% -0.040000 -0.680000 0.462400 0. E(x) = 0.280000 variance = 0. standard deviation = 25.61%
d. Outcome Probability Outcome value px x-E(x) (x-E(x))^2 p(x-E(x))^2 A 10% $1,000 $100 -$2,000 4,000,000 400, B 20% $2,000 $400 -$1,000 1,000,000 200, C 40% $3,000 $1,200 $0 0 0 D 20% $4,000 $800 $1,000 1,000,000 200, E 10% $5,000 $500 $2,000 4,000,000 400, E(x) = $3,000 variance = 1,200, standard deviation = $1,
- There is a 50% probability that the Plum Company's sales will be $10 million next year, a 20% probability that they will be $5 million, and a 30% probability that they will be $3 million. a. What are the expected sales of Plum Company next year? Expected value = $6.9 million b. What is the standard deviation of Plum's next year's sales?
βp = 0.3333 + 0.3333 + 0.3556 = 1.
b. What is the portfolio's expected return?
E(p) = (1.5/4.5)0.12 + (1/4.5) 0.135 + (2/4.5) 0.
E(p) = 0.04 + 0.03 + 0.04 = 0.11 or 11%
- ABC Company has a beta of 1.2. The expected risk-free rate of interest is 4% and the expected premium for the market as a whole is 5%. What is the expected return for ABC Company stock?
r = 4% + 1.2(5%) = 10%
- Consider Securities D and E with the following estimates:
E(RD) = 8% σD= 12% E(RE) = 13% σE = 20%
Now consider the portfolios that can be formed with D and E, assuming that the investment is equal between D and E (that is, each has a weight of 50%). What is the portfolio’s standard deviation if the correlation between D and E for each of the following?
[ ]
/
⎡ ⎤ ⎢⎣ ⎥⎦
2 2
2 2 2 2
N N N p i i i j i j ij i=1 i=1 j=1j=i
p=^ (0.5 0.12^ )+(0.5 0.2^ ) +2 (0.5)(0.5)(0.12)(0.2) 1.
p=^ 0.0036+0.0100+0.012=^ 0.0256=0.
(a) rij
σ = X σ + X X σ σ r
= ⎡⎢⎣^ + ⎤⎥⎦+ [ ]
= + + = =
(0.5^2 0.12 )^2 (0.5 0.2 )^2 2 2 (0.5)(0.5)(0.12)(0.2) 0. p
0.0036 0.0100 0.0036 0.0172 0.
j
p^9
(b) ri 0
(0.5 0.12 )^2 2 (0.5 0.2 )^2 2 2 (0.5)(0.5)(0.12)(0.2) 0. p
0.0036 0.
i
p^0100 0.0^ 0.0136^ 0.
j
619
σ
(c) r 0.
σ
= ⎡^ + ⎤+ (^) ⎡ ⎤ ⎢⎣ ⎥⎦ ⎣^ ⎦
= + + = =
= (0.5 0.12 )+(0.5 0.2 ) +2 (0.5)(0.5)(0.12)(0.2)( -1.0)^2 2 2 p
= 0.
ij
p 6+0.0100-0.012=^ 0.0016=0.
(d) r = -1.
σ
σ
⎡ ⎤ (^) ⎡ ⎤ ⎢⎣ ⎥⎦ ⎣^ ⎦
- Consider Securities X and Y with the following estimates:
E(R X ) = 5% σ X = 10% E(RY) = 15% σ Y
If the portfolio is comprise of 40% X and 60% Y and if the correlation between the returns on X and Y is -0.25, what is the portfolio’s expected return and risk?
Expected return = 0.4(0.05) + 0.6(0.15) = 0.02 + 0.09 = 0.11 or 11%
Variance = (0.4)(0.4)(0.10)(0.10) + (0.6)(0.6)(.25)(.25)+(2)(0.4)(0.6)(0.1)(0.25)(-0.25) Variance = 0.0016 + 0.0225+-0.0030 = 0.
Standard deviation = 14.5268%
