
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
To implement the "double reduction" policy, a school carried out a reading activity with the theme of "bookish campus" using after-school services. They need to purchase a total of $100$ books of type A and type B for students to read. The unit price of type A book is $10$ yuan per book, and the unit price of type B book is $6$ yuan per book. If $x$ books of type A are purchased, then the cost of purchasing type B books is ______.

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