Consider the following information:

Cash Flows $($$$)$

Project C$0$ C$1$ C$2$ C$3$ C$4$

A $5,0002,7002,700-4000$

B $2,00001,0003,7004,700$

C $5,0001,0001,0003,0001,700$

a$.$ What is the payback period on each of the above projects?