Question 1005213
We use r for the rate of depreciation, such that (I am assuming that the depreciation is compounded...if not, 15% per year is the answer)
35080 = 58500*(1-r)^4
Solve for r...
(1-r)^4 = .6
1-r = .6^(.25)
1-r = .88
r = .12 = 12%