A bank faces two types of borrowers, A and B, both who request a $100 loan. A will repay the loan with probability 0.96 and default otherwise, while B will repay the loan with probability 0.75 and default otherwise. The bank cannot observe type, but knows that fraction 0.65 of borrowers are type A and the rest are type B. What is the competitive pooling interest rate?
A) 16%
B) 6%
C) 21%
D) 13%