I am having a argument with my online,first mistake, math class instructor about a question on a test. Question is: Guy gets a 20% raise and now makes $67,200, what was is pervious salary. I said the answer is $53,760. The test said no it is $56,000. I used the method of 67,200 times .2 and got 13,440. Subtracted that from 67,200 and got 53,760. Or another way I could have done it was 10% of 67,200 is 6,720, times two to make it 20% and you get 13,440. 13,440 subtracted from 67,200 is 53,760. The method she explained I should have used and they have been using is as fallows. new salary = old salary + raise 67,200 = x + 20% (x) The 20% has to be times the old salary. 67,200 = x + .2 x Change percent to decimal 67,200 = 1.2 x combine like terms 67,200/1.2 = 1.2 x/1.2 Divide by 1.2 to isolate x $56,000 = x Check: 56000 + 56000(20%) = 67200 56000 + 11200 = 67200 So either way you get 67,200 as the new amount. Which is correct? Makes me mad that this question is so simple but is such a cluster.