Melissa's homeroom raised 63% of its goal for the school fundraiser. Matt's homeroom has raised 48%. Since it is a percentage of their goal, a situation in which Matts homeroom raised more money that Melissa's homeroom is when Matts goal is much bigger than melissas goal, so even if melissas has bigger percentage, matt has more money.
Example
Matts goal is 1000 so 1000*.48 = 480
Melissas goal is 500 so 500*.63 = 315