A present value of a machine is $1000. Its value depletiation rate is 10% per annum then find the machine value after 2 years?
Select
A) $ 900  B) $ 810  C) $ 915  D) $ 715  E) $ 795

Rationale: "p = $ 1000 r = 10 % t = 2 years machine value after 2 years = p [ ( 1 - r / 100 ) ^ t ] = 1000 * 9 / 10 * 9 / 10 = $ 810 answer is b"
Answer: B