Question

A company that makes hair-care products had 7,000 people try a new shampoo. Of the 7,000 people, 21 had a mild allergic reaction. What percent of the people had a mild allergic reaction? (Decimal form)

(a) 0.3%
(b) 0.7%
(c) 3%
(d) 7%

Answer 1

The percent of people who had a mild allergic reaction to the new shampoo is calculated by dividing 21 by 7,000, then multiplying by 100, resulting in 0.3%, corresponding to option (a).

Step-by-step explanation:

To calculate the percent of people who had a mild allergic reaction to a new shampoo, we divide the number of people who had an allergic reaction (21) by the total number of people who tried the shampoo (7,000), then multiply by 100 to convert the decimal to a percentage.

Let's calculate it step by step:

1. Divide the number of reactions by the total number of people: 21 ÷ 7,000 = 0.003
2. Multiply by 100 to get the percentage: 0.003 × 100 = 0.3%

Therefore, the percent of people who had a mild allergic reaction to the shampoo is 0.3%, which corresponds to option (a).