Answer: (A) $4560 when customer is charged $60
Explanation:
p(x) = 80 - 2x where p(x) represents the number of customers
c(x) = 50 + 5x where c(x) represents the price charged to customers
x represents the number of $5 increases to the $50 charge
(p · c)(x) = (80 - 2x)(50 + 5x)
= 80(50 + 5x) -2x(50 + 5x)
= 4000 + 400x - 100x - 10x²
= 4000 + 300x - 10x²
(p · c)(2) = 4000 + 300(2) - 10(2)²
= 4000 + 600 - 40
= 4560
the company will receive $4560 when 2($5) is added to the $50 charge