Consider the following four step process: -A-B-C-D- The following data are available for the four steps: B D Activity time per unit (min) 5 3 2 4 Number of Workers 2 3 1 1 Suppose the steps in activity D are made easier, so the activity time per unit in step D is reduced by 50% (to 2 min per unit). If the assignment of workers to steps remains the same, what is the capacity of the entire process in units per min after the activity time per unit in step D is reduced by 50%? 24 30 15 60 12