Consider the following batch flow process consisting of three process steps performed by three machines: Step 1 Step 2 Step 3 Processing time: 1 minute/part Processing time: 2 minute/part Processing time: 1.5 minute/part No Setup No Setup Setup time: 20 minutes Work is processed in batch at each step. Before a batch is processed at step 1, the machine has to be set up. During a setup, the machine is unable to process any product. There are no inventory buffers between steps. Find the best batch size that achieves a flow rate of 24 parts per hour