John purchased 1/4 lbs of hamburger for $0.75. How much did the hamburger cost per pound?
Cost per pound is the cost for 1 pound of the hamburger.
1/4 lbs cost $0.75
1 lb would definitely cost 0.75 ÷ 1/4
= 0.75 × 4/1 = 3
Therefore cost per pound = $3.00