
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
A class is planning to buy some table tennis balls and table tennis rackets. Here's the information: Two stores, Store A and Store B, sell the same brand of table tennis balls and rackets. Each racket is priced at 30 yuan, and each box of table tennis balls is priced at 5 yuan. After negotiation: Store A gives away one box of table tennis balls for every racket purchased; Store B offers a 90% discount on all items. The class needs 5 rackets and several boxes of table tennis balls (not less than 5 boxes).

1. How much should be paid under each discount method when buying x boxes of table tennis balls? (Express with an algebraic formula containing x)
2. If you are to purchase 15 boxes of table tennis balls, which store would you choose? Why?

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