Consider two local banks. Bank A has
96 loans? outstanding, each for? $1.0 million, that it expects will be repaid today. Each loan has a
3%
probability of? default, in which case the bank is not repaid anything. The chance of default is independent across all the loans. Bank B has only one loan of $96
million? outstanding, which it also expects will be repaid today. It also has a 3%
probability of not being repaid. Calculate the? following:
a. The expected overall payoff of each bank.
b. The standard deviation of the overall payoff of each bank.
Overall payoff of each banks = No of Loans Outstanding * Loan
Value * (1-Probability of default )
a)Overall payoff of A = 96 * 1* ( 1-3%) = 93.12 million
Overall payoff of B = 1 * 96* ( 1-3%) = 93.12 million
b) Standard deviation = [Probability of recovery * ( Complete loan
recovery - actual recovery)2 + Probability of default *
( Zero recovery - actual recovery)2]0.5
standard Deviation of each loan of A()
= [0.97 * ( 1- 0.97)2 + 0.03 * (0
-0.97)2]0.5 = 0.17059
Standard deviation of each because there are 96 independent loans =
/N0.5 = 0.17059/(96)0.5 = 0.0174
So overall
standard deviation of all 96 loans of A =
1.6704
Standard Deviation of each loan of B()
= [0.97 * ( 100- 97)2 + 0.03 * (0 -
97)2]0.5 = 17.0587
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