A rectangle with the length of 1/5 yard and the width of 2/3 yards

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )

Samuel deposited money in an account that’s pays an annual simple interest rate at 3.5%. at the end of 5 years, samuel earns $2625.00 in interest. how much money did he deposit in the account?

A. 10.8 cm^2 b. 5.4 cm^2 c. 7.4 cm^2 d. 21.6 cm^2