Which calculation does NOT find the price per kilogram when 2.4 kilograms cost 6 dollars?

Explication

Dividing price by mass gives 6 ÷ 2.4 = 2.5 dollars per kilogram, and the equivalent divisions 60 ÷ 24 and 3 ÷ 1.2 give the same rate. Multiplying 6 × 2.4 = 14.4 combines the quantities with the wrong operation and does not find a unit price.