CalcIt produces a line of inexpensive pocket calculators. One model, IT53, is a solarpowered scientific model with a liquid crystal display (LCD). The calculator is pictured in Figure 8–11.

Each calculator requires four solar cells, 40 buttons, one LCD display, and one main processor. All parts are ordered from outside suppliers, but final assembly is done by CalcIt. The processors must be in stock three weeks before the anticipated completion date of a batch of calculators to allow enough time to set the processor in the casing, connect the appropriate wiring, and allow the setting paste to dry. The buttons must be in stock two weeks in advance and are set by hand into the calculators. The LCD displays and the solar cells are ordered from the same supplier and need to be in stock one week in advance.

Based on firm orders that CalcIt has obtained, the master production schedule for IT53 for a 10-week period starting at week 8 is given by Week 8 9 10 11 12 13 14 15 16 17 MPS 1,200 1,200 800 1,000 1,000 300 2,200 1,400 1,800 600 Determine the gross requirements schedule for the solar cells, the buttons, the LCD display, and the main processor chips.