3. Quitmeyer Electronics Incorporated manufactures the following six microcomputer peripheral devices: internal modems, external modems, graphics circuit boards, CD drives, hard disk drives, and memory expansion boards. Each of these technical products requires time, in minutes, on three types of electronic testing equipment, as shown in the table below. INTERNAL EXTERNAL CIRCUIT CD HARD MEMORY MODEM MODEM BOARD DRIVES DRIVES BOARDS Test device 1 7 12 Test device 2 2 3 2 15 17 Test device 3 5 3 2 6 18 17 9 The first two test devices are available 120 hours per week. The third (device 3) requires more preventive maintenance and may be used only 100 hours each week. The market for all six computer components is vast, and Quitmeyer Electronics believes that it can sell as many units of each product as it can manufacture. The table that follows summarizes the revenues and material costs for each product: REVENUE PER MATERIAL COST DEVICE UNIT SOLD (5) PER UNIT (5) Internal modem 200 35 External modem 120 25 Graphics circuit board 180 CD drive 130 45 Hard disk drive 430 170 Memory expansion board 40 260 60 In addition, variable labor costs are $15 per hour for test device 1, $12 per hour for test device 2, and $18 per hour for test device 3. Quitmeyer Electronics wants to maximize its profits. Formulate this problem as an LP model