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a)
Payment = $13700
down payment = $1800
monthly payments = $527.43
Total payment = 1800 + 24(527.43)
Total payment = 1800 + 12658.32
Total payment = $14458.32
b) 13700 --------------------- 100
14458.32 --------------- x
x = (14458.32 x 100) / 13700
x = 105.54
Interest = 105.54 - 100
= 5.5 %