1. How many years are required for P10,000.00 to increase to P20,000.00 if invested at 9% per year compounded annually, semi-annually, quarterly and monthly. 2. If the sum of P12,000.00 is deposited in an account earning interest at the rate of 9% compounded quarterly, what will be the accumulated amount at the end of 8 years? 3. Annual deposits were made in a fund earning 10% per annum. The first deposit wasP2000.00 and each deposit thereafter was P200.00 less than the preceding one. Determine the amount in the fund after 4. A debt of P 15,000.00 was paid for as follows: P4,000.00 at the end of three months, P5000.00 at the and of 12 months, P3000 at the end of 15 months and a final payment F at the end of 21 months. If the rate of interest was 18% compounded quarterly, find the final payment F