Martin grew tomatoes this summer and used them to make 1/2 of a gallon of tomato sauce. He split it into 3 equal portions to freeze for using later. How many gallons was each portion?

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?