Calculate the following interest : 15% of $70 for 7 years

After investing for 7 years at 15% interest, your $70 investment will have grown to $186.20

explanation:
You can calculate Interest on your loans and investments by using the following formula for calculating simple interest: Simple Interest= P x R x T ÷ 100, where P = Principal, R = Rate of Interest and T = Time Period of the Loan/Deposit in years.

$36x 40% =$14.40 was taken off
$36+$14.40=$50.40 was original price
Hope this helps