A Company has decided on three investment opportunities. Each costs $1,000, and the firm's cost of capital is 10 percent. The cash inflow of each investment is as follows:

cash inflow			A	B	C
year
1			$300	500	100
2			300	400	200
3			300	200	400
4			300	100	500
a.	If the net present value method is used, which investment(s) should the firm make?
b.	What is the internal rate of return of investment A? The internal rate of return of investment B is 10.22% and 6.15% for investment C. Which investment(s) should the firm make?
c.	What is the payback period for each investment?

* PLEASE SHOW ALL WORKING, USE FORMULAS NOT FINANCIAL CALCULATOR.