
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
Each box of Big Fruit Yogurt costs 4 yuan. Recently, a supermarket has started a "buy two get one free" promotion, which means if you buy two boxes of yogurt, you get one box for free. If Dongdong wants to buy 10 boxes of Big Fruit Yogurt, what is the minimum amount of yuan he needs to spend?

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