1. Consider a four-step serial process with processing times given in the list below. There is one machine at each step of the process, and this is a machine-paced process. Step 1: 30 minutes per unit Step 2: 15 minutes per unit Step 3: 37 minutes per unit Step 4: 19 minutes per unit Assuming that the process starts out empty, how long will it take (in hours) to complete a batch of 108 units ? (Do not round intermediate calculations. Round your answer to nearest hour) 69 hours