During a recent week, PDQ CPA's planned to provide tax accounting services to 150 customers for $60 per hour. Each job was expected to take 2.5 hours. The company actually served 15 fewer customers than expected and the average time spent on each job was 3.0 hours each. Their revenues for the month were:

a) $1,800 more than expected

b) $1,800 less than expected

c) $2,700 more than expected

d) $2,700 less than expected