1. A loan of amount L > 0 is repaid with 72 end of month payments of 500. The annual effective interest rate is > 0. (a) Write an expression for L that is entirely in terms of interest functions at an annual effective interest rate i. (b) Suppose i 7%. Use your formula you determined in (a) to compute the loan amount L. (c) Repeat (b) with values i 8%, 9%, 10%, 12%. What do you think is happening to L as i increases