Teacher's Helper, Inc. (THInk) is a small company that produces instructional materials for the New York City public schools. It has rented several rooms in an office building for $600 a month, and has leased specialized computers for $480 a month, from SoftyWare. Both are necessary for production. The table below shows the total variable costs for each unit of output.

Output Total Fixed Total ATC AVC MC (modules) Variable Cost Cost Costs O 1080 1080 1 550 1080 1630 1630 550 550 2 1000 1080 2080 1040 500 450 3 1400 1080 2480 826.67 466.67 400 4 1850 1080 2930 732.5 462.5 450 5 2400 1080 3480 696 480 550 6 3000 1080 4080 680 500 600 7 3700 1080 4780 682.8 528.57 700 8 4500 1080 5580 697.5 562.5 800