2. (SOA \#63) Bill and Joe each put 10 into separate accounts at time t=0, where t is measured in years. Bill's account earns interest at a constant annual effective interest rate of K/25,K>0. Joe's account earns interest at a force of interest, t=K+0.25t1. At the end of four years, the amount in each account is X. Calculate X. (A) 20.7 (B) 21.7 (C) 22.7 (D) 23.7 (E) 24.7