You have $3,500 in a money market account that earns 3.00 percent interest. The inflation rate was 2.80 percent, what was the real rate of return?

Mai borrowed $5000 from a bank for 5 years and was charged simple interest. The total interest that she paid on the loan was $1500. As a percentage, what was the annual interest rate of her loan? If necessary, refer to the list of financial formulas. []% ?

Frank invests $ 4500 dollars into an account earning interest compounded quarterly. After 7 years there is $ 6100 in the account. What was the interest rate?