Touche Young has three auditors. Each can work up to 160 hours during the next month, during which time three projects must be completed. Project 1 takes 130 hours, project 2 takes 140 hours, and project 3 takes 160 hours. The amount per hour that can be billed for assigning each auditor to each project is given in the file P05_49.xlsx.

Determine how to maximize total billings during the next month.