Consider the investment projects in the table below, all of which have a four-year investment life. Project's Cash Flow ($) n A B C 0 -$3,800 -$5,200 -$3,800 -$2,800 1 0 $2,200 -$1,600 -$800 2 0 $3,800 $6,700 -$,600 3 0 $4,400 $6,800 $9,400 4 $12,500 $3,600 $6,900 $8,800 (a) What is the payback period of each project? (b) What is the discounted payback period at an interest rate of 15% for each project