Brianna works at an electronics store as a salesperson. Brianna earns a 4% commission on the total dollar amount of all phone sa
les she makes, and earns a 4% commission on all computer sales. How much money would Brianna earn in commission on a day that she sold $1900 worth of phones and $1600 worth of computers? How much money would Brianna earn in commission on a day that she sold $xx worth of phones and $yy worth of computers?
