Isaiah works at an electronics store as a salesperson. Isaiah earns a 8% commission on the total dollar amount of all phone sales he makes, and earns a 2% commission on all computer sales. How much money would Isaiah earn in commission on a day that he sold $1000 worth of phones and $1500 worth of computers? How much money would Isaiah earn in commission on a day that he sold $pp worth of phones and $cc worth of computers?