Abusiness has $15,000 to spend on airline tickets to travel to a conference. it wants 27 of its employees to attend. the business wants to buy as many business-class seats as possible. the business-class seats cost $700. the economy-class seats cost $375. how many of each type of ticket should the business purchase? . a) 11 business class and 16 economy class. b) 12 business class and 15 economy class. c) 15 business class and 12 economy class. d) 16 business class and 11 economy class