5. Mary purchases an increasing annuity immediate for 50,000 that makes 20 annual payments as follows: (i.) P, 2P, ...., 10P in years 1 through 10; (ii.) 10P (1.05), 10P (1.05),..., 10P (1.05) in years 11 through 20. The annual effective interest rate is 7% for the first 10 years and 5% there- after. Calculate P