(a) Holding Period Return = (P1-P0+D)÷P0
Where, P1 is Price at the end of the period
P0 is Price at the beginning of the period
D is the Dividend for the period
As there is no mention of Dividends or earnings in the question, Dividends are assumed to be not declared.
For Security A
P0 | State | P1 | R=(P1-P0)÷P0 | Probability(p) | p×R |
100 |
Good |
120 | 20% | 0.5 | 10% |
100 | Bad | 140 | 40% | 0.25 | 10% |
100 | Ugly | 80 | -20% | 0.25 | -5% |
Total( mA) | 15% |
Here mA means Return of the Security, while R represents return at each phase.
For Security B
P0 | State | P1 | R=(P1-P0)÷P0 | Probability(p) | p×R |
100 | Good | 140 | 40% | 0.5 | 20% |
100 | Bad | 60 | -40% | 0.25 | -10% |
100 | Ugly | 200 | 100% | 0.25 | 25% |
Total (mB) | 35% |
Here mB means Return of security B, while R represents return at each stage
(b) Calculation of Variance and Covariance of Securities A and B
mA | mB | A-mA | B-mB | p |
Variance of A =p(A-mA)2 [in %2] |
Variance of B=p(B-mB)2 [ in %2] |
Covariance of A and B=p(A-mA)(B-mB) |
15% | 35% | 5% | 5% | 0.5 | 12.5% | 12.5% | 12.5% |
15% | 35% | 25% | -75% | 0.25 | 156.25% | 1406.25% | -468.75% |
15% | 35% | -35% | 65% | 0.25 | 306.25% | 1056.25% | -568.75% |
Total | (475%)2 | (2475%)2 | (-1025%)2 |
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