# Math Help - Stuck on this question. Successive Discounts and Depreciation

1. ## Stuck on this question. Successive Discounts and Depreciation

Im stuck on this question because i keep getting the wrong answer.. Please give me the answer with full working out.

Craigh bought a computer system 3 years ago for $9800. It is now valued$4134. Using the reducing balance method find the annual rate of depreciation.

Here is my working out:
4134 = 9800(1-X)^3
-9800 - 9800

-5666 = (1-X)
^3

Cube root each side

-17.83 = 1-x

-18.83 = -x

x = 18.83

Please tell me the errors

2. ## Re: Stuck on this question. Successive Discounts and Depreciation

Originally Posted by kevinsta
Im stuck on this question because i keep getting the wrong answer.. Please give me the answer with full working out.

Craigh bought a computer system 3 years ago for $9800. It is now valued$4134. Using the reducing balance method find the annual rate of depreciation.

Here is my working out:
4134 = 9800(1-X)^3
-9800 - 9800

-5666 = (1-X)
^3

Cube root each side

-17.83 = 1-x

-18.83 = -x

x = 18.83

Please tell me the errors
It seems you are attempting to solve 4134 = 9800(1 - x)^3
First, divide both sides by 9800
(4134/9800) = (1 - x)^3 = 0.4218
Take the cubic root for both sides
0.75 = 1 - x
find x