Question 1093084
Take 1000 product
============A===B====C===Total
Defects======10==20===24====54
No defects===190==480==276==946
Total========200==500==300==1000
There are 54 of 1000 defective so the answer to a is 5.4%
If it is defective (54), 24 came from C, so that is 24/54 or 4/9 or 44.4%, answer to b.