What will happen when you combine the number1 to infinity and 2

Me. drysdale earned 906.25 in interest in one year on money that he had deposited in his local bank if the bank paid an interest rate of 6.25% how much money did mr. drysdale deposit

Will give brainliest if you answer question correct

How do you use the elimination method for this question? explain, because i really want to understand!