A partially amortizing loan for $90,000 for 10 years is made at 6 percent interest. The lender and borrower agree that payments will be monthly and that a balance of $20,000 will remain and be repaid at the end of year 10 . Required: a. Assuming 2 points are charged by the lender, what will be the yield if the loan is repaid at the end of year 10 ? b. What must the loan balance be if it is repaid after year 4 ? c. What will be the yield to the lender if the loan is repaid at the end of year 4 ? Note: Do not round intermediate calculations. For all requirements, round your final answers to 2 decimal places