Lucy works at an electronics store as a salesperson. lucy earns a 6% commission on the total dollar amount of all phone sales she makes, and earns a 2% commission on all computer sales. how much money would lucy earn in commission on a day that she sold $1100 worth of phones and $1900 worth of computers? how much money would lucy earn in commission on a day that she sold $xx worth of phones and $yy worth of computers?