Calculate the NPV for the following:

a) An outflow of $7,000 followed by inflows of $3,000. $2,500 and $3,500 at one year intervals at a cost of capital of 7%.

b) An initial outlaw of $35,400 followed by inflows of $6,500 for 3 years and then a single inflow in the fourth year of $18,000 at a cost of capital of 9%. (Recognizing the first 3 inflows as an annuity in your calculation)

An initial outlay of $27,500 followed by an inflow of $3,000 followed by 5 years of inflows of $5,500 at a cost of capital of 10%.(recognize the last 5 inflows as an annuity, but notice that it requires a treatment different from the annuity in part b.