Use a formula or a financial calculator to get the answers and please show the steps

Question 28 What is the profitability index for an investment with the following cash flows given a 14.5 percent required return? Year Cash Flow 0 -$46,500 1 $12,200 $38,400 3 $11.300 2 0.94 0.98 1.06 1.02 1.11 SA Question 29 1 points You are considering a project with an initial cost of $7.800. What is the payback period for this project if the cash inflows are $1,100, 51,640, $3,800, and $4.500 a year over the next four years, respectively 4.21 years 3.36 years 3.21 years 4.29 years 3.28 years