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Interest rate and probability

Suppose a bank is faced with two types of borrowers (a high risk borrower that should be charged an interest rate of 9% and a low risk borrower that should be charged an interest rate of 4%). There is a 30% chance of getting a high risk borrower and a 70% chance of getting a low risk one. What is the expected interest rate that will be charged by a bank that cannot exactly distinguish between the two types but knows the probabilities of each type. In this market for loans what would be the result?

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You need to multiply the interest rate of the high risk borrower with the percentage ...

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This solution is comprised of a detailed explanation to answer what is the expected interest rate that will be charged by a bank that cannot exactly distinguish between the two types but knows the probabilities of each type.

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