The area of a rectangular surface is given by the product of its length and width. The total area Jake wants to paint is that of the four side walls and the ceiling. That is ... A = (8 ft)(14 ft) +(8 ft)(12 ft) +(8 ft)(14 ft) +(8 ft)(12 ft) +(14 ft)(12 ft) A = (8 ft)*2*(14 ft +12 ft) +(14 ft)(12 ft) . . . . rearranging to simplify a bit A = 2*(8 ft)(26 ft) +(14 ft)(12 ft) A = 416 ft² +168 ft² A = 584 ft²
6 pints of paint will cover 6*(90 ft²) = 540 ft², not quite enough. The next higher multiple of 90 ft² is 7*(90 ft²) = 630 ft², more than adequate.
Jake will need to purchase 7 pints of paint.
The cost of Jake's purchase will be 7*$7.98 = $55.86.
