Consider the following four step process:

The following data are available for the four steps:

A B C D

Activity time per unit (min) 0.25 0.33 0.2 0.5

Capacity per worker (units/min) 4 3 5 2

Number of workers 2 3 2 4

Now they introduced a new system and the steps in activity D are made easier, so the activity time per unit in step D is reduced by 50% (to 0.25 min per unit) and simultaneously they also reduced the number of workers to 3. The assignment of workers to every other steps remains the same. What is the capacity of the new system?