Emily and Frank shared a pizza with equally-sized slices. Emily wanted a plain pizza, but Frank wanted mushrooms on two-fifths of the pizza. The cost of a plain pizza was dollars, and there was an additional cost of dollars for putting mushrooms on two-fifths. Frank ate all the slices of mushroom pizza and one plain slice. Emily ate the remainder. Each paid for what he or she had eaten. How many more dollars did Frank pay than Emily?
3
4
5
6
7
