Sean Lee purchases $20,000 worth of supplies for his restaurant by making a $3000 down payment and

Question:

Sean Lee purchases $20,000 worth of supplies for his restaurant by making a $3000 down payment and amortizing the remaining cost with quarterly payments over the next 5 years. The interest rate on the debt is 16%, compounded quarterly.
(a) The size of each payment.
(b) The total amount paid for each purchase.
(c) The total interest paid over the life of the loan.