An investment offers $5,300 per year for 15 years, with the first payment occurring one year from now. If the required return is 7 percent, the present value of the investment is $. If the payments occurred for 40 years, the present value of the investment would be $. If the payments occurred for 75 years, the present value of the investment would be $????. If the payments last forever, the present value would be $?