With a principal investment of $31,500, which account will have the greatest value after 4 years? simple interest: i = p • r • t interest compounded annually is a = p (1 + r)t interest compounded quarterly: a = p (1 + )4t a. 2.3% with interest compounded annually b. 2.1% with interest compounded quarterly c. 2.5% in a simple interest account d. 2.4% with interest compounded quarterly