Can someone help me with these questions? I know how to calculate an annuity but I don't know how to do with payment made end/beginning of the year, thanks A/ The present value of $500 per year for 20 years at 10%. Assume that payments are made at the end of each year. B/ The present value of $500 per year for 20 years at 10%. Assume that payments are made at the beginning of each year. Also, C/ You are planning to borrow $500,000 on a 5-year, 10%, annual payment, fully amortized term loan. What fraction (percentage) of the payment made at the end of the second year will represent repayment of principal?.