It costs $36 for 12 gallons of gas. Mark is trying to determine how much it will cost to fill his 16-gallon tank. He divides 12 by 36 to find the unit rate and determines that it costs $0.33 per gallon. Then, he multiples $0.33 by 16 gallons to determine that the total cost to fill the tank is $5.33. What error did Mark make in calculating the cost to fill his car?
He made an error in calculating the unit rate. He divided the numbers in the wrong order.
He made an error in calculating the total cost. He should have added $0.33 and 16, not multiplied them.
He made an error in calculating the unit rate. He divided when he should have subtracted.
He made an error in calculating the total cost. He multiplied the numbers in the wrong order.
He made an error in calculating the total cost. He should have added $36 to his total.