Question

Tammi deposited $520 into a bank account that earned simple interest each year. After 5 years, she had earned $156 in interest.

Answer 1

Annual means yearly so you need to get the rate each year
156/5=31.2
31.2 Dollars every year
31.2/520=.06
.06*100=6% interest rate every year

Answer 2

520 is the principal, 156 is the total interest in 5 years. Divide the 156 by 5, and you get $31.20 per year. divide: 31.2 / 520 = 0.06. convert that to a fraction, and you get the answer: 6%