Calculate area of tetrahedron given 4 vertices

let p be present value of the equipment's salvage value .

it is given the salvage value on a piece of equipment for excavators, inc. is expected to be $10,000 in 12 years.

a= final amount ,p the present amount ,t= time.

we have a= 10,000,r=8%=0.08,t=12.

substituting the values we have:

or p=$3971(approx).

the present value of the equipment's salvage value is $3971.