PLEASE EEXPLAIN

Question

Bryan needs to paint a 90 ft by 40 ft rectangular billboard with white paint in order to prepare it for the next advertising theme. Two coats of paint will be needed. Bryan is a contractor, buys his white paint in bulk for $19.95 per gallon, and can reuse any leftover paint for another job. If one gallon covers about 225 square feet, give the approximate value of the paint that Bryan will use for this job.
a) $810
b) $1,485
c) $640
d) $320
e) $46
f) None of the above.

Answer 1

The area of the billboard is

90(40) = 3600 ft²

 

(3600 ft²)/(225 ft²/gal) = 16 gallons

FOR 1 COAT.

 

Since he must do 2 coats of paint we have

to double to amount of paint.  The billboard

will require 32 coats of paint

 

32($19.95) = $638.40

 

Approximate cost:  c - $640

Answer 2

Area of the billboard = 90*40 = 3,600 sq ft

Paint needed = 3600/225 = 16 gallons

Cost for the paint = 16 * 19.95 = $320

Two coatings = $640

The answer c)