Which best describes the error in finding the percent increase from 18 to 26?

You need to calculate percent % increase from 5% to 15%. First Step: find the difference between two percentages, in this case, it's 15% - 5% = 10%. Second: Take 10 percent, and divide by 2nd percentage: 10/5 = 2. Now multiply this number by 100: 2*100 = 200%. You're done! You calculated difference of a number in percent, and the answer is a percentage increase of 200% percent.

Percent increase/Decrease is:

Difference/Original * 100 = Percent Change

(26-18) / 18 * 100

8/18 * 100

.44 * 100 = 44.44 %