Granfield Company has a piece of manufacturing equipment with a book value of $39,500 and a remaining useful life of four years. At the end of the four years the equipment will have a zero salvage value. The market value of the equipment is currently $21,900 Granfield can purchase a new machine for $119,000 and receive $21,900 in return for trading in its old machine. The new machine will reduce variable manufacturing costs by $18,900 per year over the four-year life of the new machine. The total increase or decrease in net income by replacing the current machine with the new machine (ignoring the time value of money) is: Multiple Choice $21.500 Increase $75,600 decrease 517600 decrease $21.500 Increase $75,600 decrease $17.600 decrease $51,650 increase $21,500 decrease