A loan of Php 50,000 due 5 years from now and Php 50,000 due 10 years from now is to be repaid by a payment of Php 20,000 in 2 years, a payment of Php 40,000 in 4 years and a final payment at the end of 7 years. If the interest rate is 5% compounded annually, how much is the final payment?