11.4.11: In order to buy a used car, a person borrows $4000 from the bank
at 12% interest compounded monthly. The loan is to be paid off in 3
years with equal monthly payments. What will the monthly payments be?


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11.4.14: John buys a stereo system for $605.54 and pays for it with monthly
payments of $90. The interest rate is 12% compounded monthly. Determine
the amount still owed after 4 months. After how many months will the loan
be repaid?