Oriole Manufacturing is considering the purchase of a new sewing machine that costs $16000. The machine, because of its efficiency, will save about $3520 in cost each year. The machine is expected to have a salvage value of $2640 and a life of 6 years. Oriole's required rate of return is 12%. Using the present value tables, what is the machine's net present value? (round to the nearest dollar)

a) $21120

b) $13360

c) $1337

d) $-191