Machine A was purchased three years ago for $23,000 and had an estimated MV of $2, 300 at the end of its 10-year life. Annual operating costs are $2, 300. The machine will satisfactorily for the next seven years. A salesperson for another company is offering Machine B for $57,000 with an MV of $5, 500 after 10 years. Annual operating costs will be $1, 500. Machine A could be sold now for $17,000, and MARR is l 5% per year. Compare the before-tax equivalent uniform annual cost EUAC of the defender(keeping Machine A) to the challenger (buying Machine B). To answer this problem, calculate the value of the difference in annual costs: EUAC(challenger) -EUAC(defender) = EUAC(Machine B) - EUAC(Machine A). (Enter your answer as a number without the dollar $ sign.)