23. Determine the annual interest rate on the following debt contracts:

a. A $25,000 mortgage with monthly payments of $209.80 to be paid off in 25 years.

b. Solve the problem in a considering that the lender is charging a 2% fee at the time the loan is taken out so that the actual amount being lent you is less than $25,000.

c. An installment loan for $2,000 that has monthly payments of $66 for the 36 months and an additional balloon payment of $150 in the last month.

(please don't solve with excel) please use a financial calculator method or a formula. thanks!