I have the following chart that I am supposed to find the percent increase in one step. The directions specifically say not to use a two step method.

Question

10.5
12.5
14.9
17.7
21.1
25.1

So I divide 12.5 by 10.5, 14.9 by 12.5, etc.

When I do this (and round) I get about 19% increase for each one. (we are supposed to round. )

Then I have another chart that we are supposed to find the percent decrease also using the one step method.

80.2
71.4
63.5
56.5
50.3
44.8

If I use the same method I get about 12% decrease each time but the answer says 11% each time. If I do it the opposite way, for example, 71.4/80.2 and then subtract from 1.00 I would get more like 11%.

I'm just not really certain of the methodology to get the correct 11% answer.

Thank you

Answer 1

1. 12.5/10.5 = 1.190 = 119%.
119%-100% = 19% Increase.

2. 71.4/80.2 = 0.890 = 89.0%
89%-100% = -11% = 11% Decrease.