During a recent month, canon company planned to provide cleaning services to 30 customers for $ 26 per hour. each job was expected to take 8 hours. the company actually served 12 more customers than expected, but the average time spent on each job was only 7.5 hours each. canon's revenues for the month were: a. $250 more than expected. b. s250 less than expected. c. $750 more than expected. d. cannot be determined from data given

Employees at a library check out books to patrons. books have an isbn and a name. the library sometimes has multiple copies of the same book. books have one or more authors. a patron is an individual who has an active (non-expired) library card. for each library card, we store the person's first and last names and their address. for each employee, we store their employee id, current salary, first and last name and their address. we also store the employee id of their current manager. each time we check out a book to a patron we need to store the date of the transaction, the employee who checked out the book to the patron, and the library card of the patron. some employees have library cards. if an employee patron turns in a book late, the fine that they pay is a percentage of their salary. some employees are authors who have library cards—they are allowed to check out as many books as they like.