Can you find solution of this: $)$ Andri plans to deposit $12,000$ into a bank account for three years. The customer service representative tells him he has two options:

Receive $9\mathrm{.}2\%$ annual simple interest

Receive $8\mathrm{.}7\%$ annual compound interest Which option offers a better return for Andri, and what is the difference?

b$)$ N$$i took out a loan from a payday loan company, which involves him paying $25$ per month for $6$ months, with the first payment due immediately. The loan company charges $24\%$ annual interest, calculated monthly. How much did N$$i borrow?

c$)$ D$$ra takes out an annuity loan of $7,500$ to buy a car. The terms of the loan state that she must make equal monthly payments for four years. The loan's annual interest rate is $8\mathrm{.}5\%,$ compounded monthly. What will the amount of each loan payment be$?$