Hector put 13 gallons of gas into his car at $3.175 per gallon. Rounded to the nearest cent, how much does Hector owe at the pump?

1. The cost is the number of gallons times the price of one gallon. 2. Multiply: 13 times 3.175 equals 41.275 dollars. 3. Money is rounded to the nearest cent, the hundredths place, so look at the digit to its right, which is 5. 4. Since that digit is 5 or greater, add 1 to the hundredths digit: 41.275 rounds to 41.28. 5. Cutting the extra digit off without rounding gives $41.27, which shortchanges the pump by the rounding rule. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 5 "Decimals", section 5.2 Decimal Operations_