Joy has 30 pencils, and Colleen has 50 pencils. If they bought the pencils at $4 each at the store, how much more money did Colleen pay than Joy for her pencils? Think carefully first, then make a decision:
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The number of pencils that Colleen has more than Joy is 50 - 30 = 20 pencils. If each pencil was sold at $4 each, Colleen paid $4 * 20 = $80 more for the 20 extra pencils she has more than Joy. So, the answer is 80.
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