ABC Company is interested in buying a piece of equipment for $150,000. The average useful life of the equipment is anticipated to be five years, with projected annual cash flow of $22,000. Calculate the net present value of the equipment at 8%. Assume no salvage value. The department you manage would like to buy a piece of equipment for $20,000 with projected cash flows of $4,500 per year over the eight-year useful life. Calculate the net present value at 10%. Assume no salvage value. Explain how to solve ?

I understand that the first answer is year 1 20,370.37 is the present value of future cash flows but I do not know how to get this answer?