Mathematics, 02.02.2021 01:00 rhlalbin
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?
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A skin-care company had 1,500 people try a new acne cream. Nine people had a mild allergic reaction....
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