The XYZ Manufacturing Company is evaluating options for spending on product quality and wants to find the optimal amount to spend on changing its processes to further prevent defects. Its engineers have developed the following estimates: 1. Defects The current defect rate is 10%. If it invests an additional $10 per unit in prevention costs, the defect rate will drop to 6%; spending $20 per unit on prevention drops the defect rate to 3%; spending $30 per unit drops the defect rate to 1.5%; and investing $40 per unit on prevention reduces the defect rate to 1%. 2. Inspection Inspection costs are $5 per unit. Inspection is successful at detecting 98% of defective units; the remaining 2% of defective products are sold and eventually returned for warranty repairs or replacement at no cost to the customer. 3. Internal failure costs are $400 per defective unit that is detected. 4. External failure costs are $1000 per unit returned. 5. Current production level is 1 million units. REQUIRED: A. Create and submit a spreadsheet that calculates total quality costs for the existing process and for each of the four options for investing in additional prevention