The process for making a hot sandwich at Mr Sub includes three steps as follows: [Chapter 4] Step 1: Receiving the order Step 2: Putting all the ingredients together & toasting in the oven Step 3: Packing the sub Step 1 (1 min/unit) Step 2 (4 min/unit) Step 3 (3 min/unit) Assuming that there is only one staff member to make each hot sandwich, what is the maximum number of hot sandwiches that can be made in 4 hours? 30 60 80 240 None of the above