Patty is a customer service representative for a company. She earns $18 an hour, plus an additional $2.50 each time one of her customers completes a company survey. This week, Patty plans to work 38 hours. If Patty wants to earn at least $750 this week, which inequality could she solve to find the number of surveys, s, she needs her customers to complete this week?
a. 20.5s > 750
b. 18(s + 2.5) > 750
c. 18(38) + 2.5s > or equal to 750
d. 18(2.5s + 38) > or equal to 750