Consider the following batch$-$flow process consisting of three process steps performed by three machines:

Step $1->$ Step $2->$ Step $3->$

Process Time $0\mathrm{.}20$ min$/$unit $0\mathrm{.}40$ min$/$unit $0\mathrm{.}25$ min$/$unit

Setup Time $30$ mins $20$ mins $35$ mins

Suppose units are produced in batches of $50,$ what is the capacity of the entire process $($in units$/$min$)?$