
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
Two tribes share one shaman. One tribe lives in the river valley, and the other on a hillside. Due to the spread of the internet and rumors, the shaman had to lower the prices of his services. For the tribe living in the valley, prices decreased by $10\%$ "in furs" and $15\%$ "in fish". The ratio of fur to fish prices on the local market remains constant. For the tribe on the hillside, the price "in furs" decreased by $20\%$. By how many percent did the price "in fish" decrease for this tribe? Round the answer to one decimal place.

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