
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In a certain month, the price of a commodity increased by 30% in the first week, then decreased by 10% in the second week. It further rose by 40% in the third week, and decreased by $y\%$ in the fourth week. If the price of the commodity at the end of the fourth week was 5% less than its price at the beginning of the first week, find the value of $y$.
A) 30%
B) 35%
C) 40%
D) 42%
E) 45%

Present the answer in LaTex format: \boxed{Your answer}
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