Explanation:
given,
measurement of concrete = 20×40
cost of concrete per sq. = $15
so,
area of concrete driveway = l × B
= 20×40 = 800sq foot
so,
800×15 = $12000
therefore total cost of concrete driveway will be $12,000.
option B is correct
hope this answer helps you dear...tale care and may u have a great day ahead!