Question: A process has four steps. At each step a number of units are found to be defective and are discarded from the process. The table

A process has four steps. At each step a number of units are found to be defective and are discarded from the process. The table below shows the yield rate for each step:

Steps Attrition
Step 1 90%
Step 2 85%
Step 3 70%
Step 4 85%

How many units should be processed at step 1 for the process to make 20 good unit?

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