8.16 What uniform annual payment is equivalent to the following payment schedule if the interest rate is 7.5 percent, compounded annually? (a) $600 at the end of the first yeat (b) $800 at the end of the second year (c) $1.200 at the end of the third year (d) $2000 at the end of the fourth year (c) $2400 at the end of the fifth year