a company is considering two projects A and B, project A requires an initial investment of 1.5 million dollars to yield estimated annual cashflows of, year 1= 150, 000 year 2= 300 000 year 3= 500 000 year 4=200 000 year 5=600 000 year 6= 500 000 year 7=100 000 with discount rate of 13%, calculate profitability index and payback period