Answer:
a) 7.2%
b) 7.46%
Explanation:
the loan's principal = $3,200,000 x 80% = $2,560,000
first monthly payment = $17,300 x 360 payments = $6,228,000
total interests charged = $6,228,000 - $2,560,000 = $3,668,000
using a financial calculator:
n = 360
payment = -17,300
present value = 2,560,000
monthly APR = 0.6% x 12 months = 7.2%
effective annual rate = (1 + i/n)ⁿ - 1 = (1 + 0.072/30)³⁰ - 1 = 7.46%