DEVON OWNS A HOUSE CLEANING COMPANY AND HAS TO GIVE PRICE QUOTES TO POTENTIAL CUSTOMERS. HE FIGURES OUT HIS PRICE BY ASSUMING A $25 BASE CHARGE AND THEN ADDING $8 FOR EACH BATHROOM AND $4 FOR EACH OTHER ROOM. IF HE USES P TO REPRESENT THE PRICE B FOR BATHROOM AND R FOR OTHER ROOMS, WHICH OF THESE REPRESENT HIS PRICE QUOTE FORMULA