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?
The number of pencils that Colleen has more than Joy is 50-30 = <<50-30=20>>20 pencils.
If each pencil was sold at $4 each, Colleen paid $4*20 = $<<4*20=80>>80 more for the 20 extra pencils she has more than Joy.
#### 80