Question: A pharmaceutical company creates a compound with a four-stage process: Some of the resources have partial yields: 15 percent of material is discarded after the
A pharmaceutical company creates a compound with a four-stage process:

Some of the resources have partial yields: 15 percent of material is discarded after the Acid step and 45 percent of the material is discarded after the separation step. The capacities of the last three steps are indicated in the diagram above.
(a) What is the yield of this process?
(b) What is the minimum capacity (kg/hr) of the first step, Heat, so that the process can yield 100kg/hr of final product?
Acid Reaction Separation 200 kg/hr Heat 250 kg/hr 200 kg/hr 15% 45%
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