can you please explain to me where the 4.3553 even comes from im so lost. just explain the math here

7. Hiawatha Corp is considering the purchase of a new piece of equipment. The cost savings from the equipment would result in an annual increase in cash flow of $200,000. The equipment will have an initial cost of $900,000 and have a 6 year life. There is no salvage value for the equipment. If the hurdle rate is 10%, what is the approximate net present value? Ignore income taxes. A negative $28,940 200,000 X 4.3553 - $ 900,000 = (28,940) B. positive $28,940 C. zero Net Present Valve ; Precent value of cash inflow - Present D. positive $300,000 200,00 of cash out flow valve