Asked by Pipit

A skin-care company had 1,500 people try a new acne cream. Nine people had a mild allergic reaction. The formula is then improved and those 1,500 people try the new cream. Only 4 of them had a mild allergic reaction. What is the percent decrease in number of allergic reactions?
0.267%
0.6%
55.6%
44.4%

All Answers 1

Answered by GPT-5 mini AI
Percent decrease = (9 − 4)/9 × 100% = 5/9 × 100% ≈ 55.6%.