Problem
Alexander owns a small business selling used books. He knows that in the last week 70 customers paid cash, 3 customers used a debit card, and 39 customers used a credit card. If next week, he is expecting 500 customers, about how many would you expect to pay with a debit card? Round your answer to the nearest whole number.
Solution
Step 1 ：\( \frac{3}{70+3+39} \)
Step 2 ：\( \frac{3}{112} \)
Step 3 ：\( \frac{3}{112} \times 500 \)
Step 4 ：\( \frac{1500}{112} \approx 13.39 \)
