1. ABC, Inc. is considering to purchase a new machine for manufacturing a product. The fixed cost for purchasing the machine is $90,000. The variable cost is $12 per unit of product produced from the machine. The revenue is $22 per unit of product. The break-even volume for purchasing this machine is ____ units.

2.A car mechanic is thinking of guaranteeing customers some sort of an upper limit for the time it takes the repair shop to perform an oil change with a 99.73% confidence level. He takes a few samples of size 5 and finds the process mean to be 15 minutes and average sample range of 1.3 minutes. Compute the upper limit for an x-chart.