ABC plans to make equal payments into a fund on 1/1 of each year, beginning on 1/1/A with the final payment on 1/1/D, to pay the principal (only) of serial bonds maturing $50,000 on 12/31/C and $50,000 on 12/31/D. How much must be deposited annually if the fund earns 10%? How do I solve this using a BA II Plus? Can you also explain the concept of solving it? Ans: $20,568 annually