problem1: find out the value of an annuity in which $1,100 is deposited at the end of each year for 5 years, at an interest rate of 11.5 percent compounded yearly.
problem2: find out the amount of every payment to be made to a sinking fund in order to pay off a $12,000 loan in 8 1/2 years when funds earn interest at a rate of 10 percent compounded semiannually.