Year	Cash Flow (A)	Cash Flow (B)	Cash Flow (C)
0	-$50,000	-$100,000	$200,000
1	$20,000	$20,000	$20,000
2	$20,000	$30,000	$200,000
3	$20,000	$40,000	$0
4	$20,000	$50,000	$0

Assume that the 0-year payments are installation costs, and the remaining entries are net incomes for the next four years

(a) Which project should be chosen according to the payback period method?

(b) calculate AAR for each method.

(c) calculate NPV for each method.