A fab produces 20,000 wafers per month a total (fixed plus variable) monthly manufacturing cost of $24,000,000. Each wafer has 600 viable integrated circuits with a die area of 1 cm². The market price of each die is $5. The company currently runs an ISO Class 5 cleanroom which leads to an average die yield of 80.6% but is considering a move to an ISO Class 4 facility. If the total (fixed plus variable manufacturing cost for 20,000 wafer will increase to $36,000,000/month, will the increased yield and associated profit in the Class 4 facility justify this move? Use the Posson yield model and follow the sequence of calculations below.

1. Number of sellable (working) die/mo. from Class 5 fab =

2. Monthly revenue from die sales for Class 5 fab = $

3. Monthly profit for Class 5 fab = $

4. Effective defect density at 80.6% yield in Class 5 fab = cm^-2

5. Effective defect density for Class 4 fab =

6. Predictred yield in Class 4 fab = %

7. Number of sellable (working) die/mo. from Class 4 fab =

8. Monthly revenue from die sales for Class 4 fab = $

9. Monthly profit for Class 4 fab = $

10. Should the company make a move? (Yes/No)