SOLUTION: Bradley took a 15% pay cut when he switched jobs. If he makes $30,600 per year at his new job, what was his annual salary at his previous job? Please list the steps.

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Question 784742: Bradley took a 15% pay cut when he switched jobs. If he makes $30,600 per year at his new job, what was his annual salary at his previous job? Please list the steps.
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
$x= previous job salary
$x-30600= decrease in salary (pay cut as $ amount)

You can look at the calculations two ways:

THE SIMPLER WAY (no need to mention algebra; a fifth grader can do it):
Bradley may have compared the new salary to the old salary (dividing the new salary by the old one) and the result was 0.85=85%2F100=%2285+%25%22.
That would have told him that the % pay cut was
100% - 85% = 15%
To reverse that calculation, you would start by
100% - 15% = 85% and that would tell you that Bradley is now making only 85% of the previous job salary.
As a fraction, 85% is 0.85=85%2F100=%2285+%25%22.
The new salary is 0.85+=85%2F100 of the old one,meaning that it is
%22%24%22+0.85%2Ax%22=%22%22%24%22%2230%2C600%22
Reversing that calculation,
x=30600%2F0.85 --> x=36000
(Simple calculators that have a % key, use the number 0.85 when you enter 85%, so I enter 30600 ÷ 85 %, and I get 36000 without even touching the = key).

ANOTHER WAY OF LOOKING AT IT:
When calculating the percent pay cut, Bradley may have divided the $ amount of the pay cut by the old salary and the result was 0.15=15%2F100=%2215+%25%22
%28x-30600%29%2Fx=0.15
In solving that equation, you could multiply both sides of the equal sign times x and get an equivalent equation (as long as x%3C%3E0, which is true in this case).
%28x-30600%29%2Fx=0.15-->x-30600=0.15x-->x=0.15x%2B3060-->x-0.15x=30600-->1%2Ax%2B0.15%2Ax=30600-->%281-0.15%29%2Ax=30600-->0.85x=30600%7D%7D--%3E%7B%7B%7B0.85x%2F0.85=30600%2F0.85-->x=36000
(I would write that skipping the steps than seem too obvious, but showing enough steps to satisfy the person who's reading it, or the teacher).