Question

A certain allergen affects approximately 7 people per 10,000 in the United States. Assuming the U.S. population is approximately 325 million people, how many people suffer from this allergen?

Answer 1

Step-by-step explanation:

$total \: number \: of \: people \: \\ suffering \: from \: the \: allergen \\ = 325 \: million \: \times \frac{7}{10000} \\ \\ = 325 \: \times {10}^{6} \: \times \frac{7}{10^{4} } \\ \\ = 325 \: \times {10}^{2} \: \times 7 \\ \\ = 32500 \times 7 \\ \\ = 227500 \\ \\ \because \: 1 \: million \: = {10}^{6}$