100%. 20/100 is equivalent to 20%, and because there is a 20% chance of a chip being a defect, it is 100%
Answer:
Step 2 contains error in the given problem.
Step-by-step explanation:
Given expression is:

Step 1: identifying the LCM.
The LCM identified is 6.
This step is correct.
In the next step, we multiply the LCM with each term of the equation.
Step 2:

However,
In the given solution, the LCM is not multiplied with each term.
Hence,
Step 2 contains error in the given problem.
It would be $57 weekly, and when you multiply that by 4, you get $228/month