hello please help with this questions they are manual and written not with excel thank you

the first is question 1

and the second is question 2

As finance director you have been asked to compare two possible investment projects, A and B with the following outlays and cash flows Year Project A Project B $ 0 (20,000) (25,000) 1 7,000 2,500 7,000 5,000 7,000 10,000 4 7,000 20,000 Using a cost of capital of 13% rank them using NPV, IRR, Payback and Discounted payback. A firm has a total wage bill of $8million twice a month with a 13% cost of capital. Calculate the benefit to the firm of changing to a monthly pay cycle and discuss the potential impact on the employees