Tim Smunt has been asked to evaluate two machines. After some investigation, he determines that they have the costs shown in the following table:

Machine A

Machine B

Original Cost $$10,000$ $$28,000$

Labor per year $$2,400$ $$4,000$

Maintenance per year $$4,600$ $$1,200$

Salvage value $$1,600$ $$7,500$

He is told to assume that:

$1.$The life of each machine is $3$ years.

$2.$The company thinks it knows how to make $8\%$ on investments no more risky than this one.

$3.$ Labor and maintenance are paid at the end of the year.

The NPV for Machine A$=$

$$The NPV for Machine B$=$

$($round your response to the nearest whole number and include a minus sign if $$necessary$).$