
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]


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Class 7(1) is conducting a reading activity and needs to purchase two types of books, A and B, totaling 100 books. The unit price of type A book is $10 per book, and the unit price of type B book is $6 per book. If $a$ books of type A are purchased, calculate the cost of purchasing type B books.

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