1. A loan of Rx is subject to the following repayment conditions: There are 70 quarterly payments in arrear. The first payment is R20, with each subsequent payment 3% larger until a payment of R125 is reached. Thereafter the payments remain constant. Interest charged is 20% per annum, payable quarterly. (a) Find Rx. (b) Find the interest content of the 18th payment. (c) What is the capital content of the 65th payment? (d) How much capital will have been repaid after the 65th payment is paid?