Your grandparents will charge you 4.5% compound interest per year on the borrowed amount, and you will repay the loan

Your grandparents will charge you 4.5% compound interest per year on the borrowed amount, and you will repay the loan in one payment 3 years from now (i.e., at the end of the 3rd year). How much money will you need to repay your grandparents at the end of the 3rd year