In the school chorus, 5/25 of the students are fourth-graders.
In simplest form, what fraction of the students in the school chorus are fourth graders?

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?