Carlo and Anita make mailboxes and toys in their craft shop near Lincoln. Each mailbox requires 3 hours of work from Carlo and 4 hours from Anita. Each toy requires 3 hours of work from Carlo and 1 hour from Anita. Carlo cannot work more than 18 hours per week and Anita cannot work more than 12 hours per week. If each mailbox sells for $8 and each toy sells for $14, then how many of each should they make to maximize their revenue? What is their maximum revenue? Carlo and Anita should make 80 mailboxes and toys. Their maximum revenue is $