3.1.7 Suppose that during the course of a loan, two successive pe- riods have the same interest rate (i = 1+1 = i). Show that PR,+1 = PR,(1+i)+K:+1-K,. It then follows that if K,+1 = K, and i =i+1 =i, then PR,+1 = PR. (1+i). 3.1.7 Suppose that during the course of a loan, two successive pe- riods have the same interest rate (i = 1+1 = i). Show that PR,+1 = PR,(1+i)+K:+1-K,. It then follows that if K,+1 = K, and i =i+1 =i, then PR,+1 = PR. (1+i)