Suppose that a stream of equal payments of amount $25000 per year is to continue in perpetuity. At the interest rate of 10% compute: a. the present value of this entire stream of benefits. b. the...

Suppose that a stream of equal payments of amount $25000 per year is to continue in perpetuity.
At the interest rate of 10% compute:
a.  the present value of this entire stream of benefits.
b. the present value of the benefits beginning at the end of 100th year.
c.  the present value of the first 100 years of benefits.