A newly married couple took out a 5-year $30,000 loan for their wedding. After 5 years, they paid a total of $32,800 back to the bank. What was the interest rate on the loan?
Interest at the end of 5 years. Time = 5 years, Principal = $30000
I = 32800 - 30000 = 2800.
Assuming simple interest.
I = PRT
2800 = 30000R 5
30000R 5 = 2800
R = 2800 /(30000*5)
R ≈ 0.018667
R ≈ 1.8667 %
Interest ≈ 1.8667% per year.