Present Value Computation

Raul Gomez made a deposit into his savings account 4 years ago, and earned interest at an annual rate of 12%. The deposit accumulated to $30,000. How much was initially deposited assuming that the interest was compounded (a) annually, (b) semiannually, and (c) quarterly? Use Excel or a financial calculator for computation. Round your answer to nearest dollar. Annually Semiannually Quarterly