Alumak, Incorporated, uses high-tech equipment to produce specialized products. Each one of its machines costs $55,000 to purchase plus an additional $6,000 per year to operate. The machines have a four-year life after which they are worthless. What is the equivalent annual cost of one of these machines if the required return is 15 percent?

$25,265

$18,032

$37,870

$19,750

$19,265