Question

a boat cost 92,000.00 and depreciates in value by 15% per year how much will the boat be worth after 10 years

Answer 1

Guessing you are talking about compounding value here. In that case, it should be worth around 18,100 dollars. 

Answer 2

A=p (1-r)^t
A=92,000×(1−0.15)^(10)
A=18,112