Question

A room is in the shape of rectangular prism with dimensions 20 ft $\times$ 12 ft $\times$ 10 ft. Cost of Painting the ceiling @ $\$5/{\text{ft}}^2$ is

• A. $ 1200
• B. $ 1400
• C. $ 1500

Answer 1

The correct option is A $ 1200

In the Rectangular Prism shaped room,
Dimensions are: 10 ft $\times$ 12 ft $\times$ 20 ft.



Painting Cost = $\$5$/ ft${}^2$
Area of the ceiling = Area of the floor = $l\times w$
$=20\times 12$
$=240$ ft${}^2$


Total cost for tiling = Area of the ceiling $\times$ Painting cost
= Area of the ceiling $\times$ Painting cost
$=\$240$ ft${}^2$ $\times$5/ ft${}^2$
$=\$1200$.