What should a student on scholarship do with the 5% increase in their financial grant?

If a person is eligible for the grant, there is no harm in benefiting from it and from any increase that may occur to it, because the ruling on the increase is the same as the ruling on the original grant. However, if he knows that this increase is undue, for example, if it is a result of an error from the bank or the granting authority, he must return it. If the increase is usurious interest, he must dispose of it by spending it on public welfare and charitable causes.