Taylor borrows $250,000 from Maggy at an effective semiannual interest rate of 2.25%. The loan is to be repaid with 60 semiannual payments, with the first payment made six months from the date of the loan. The first 20 payments are (X +500) and the last 40 payments are X. a) Calculate X. b) After receiving the 20th payment, Maggy sells the right to collect future payments to Doc at a price of P. Maggy earns an overall effective semiannual yield of 3.15%. Calculate P