
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
Given that a shopping mall offers a discount promotion where the rules are as follows:
1. If the total payment for a single shopping trip does not exceed 200 yuan, no discount will be given.
2. If the total payment exceeds 200 yuan but does not exceed 500 yuan, a 90% discount will be applied based on the marked price.
3. If the total payment exceeds 500 yuan, the first 500 yuan will be subject to rule 2, and the amount exceeding 500 yuan will be given a 70% discount, calculate the total payment for two separate shopping trips of 168 yuan and 423 yuan.

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