
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
Berengere and her exchange student friend Emily are at a bookstore in Paris where the prices are listed in euros and both euros and US dollars are accepted. They wish to purchase a book collectively. The book costs 15 euros, and Emily has an American ten-dollar bill. How many euros does Berengere need to contribute if 1 euro = 0.8 USD?

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