
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
Assume the number of passengers traveling from location A to location B per day, $X$, follows a normal distribution $N(800, 50^2)$. Let $p_0$ denote the probability that the number of passengers traveling from A to B in a day does not exceed 900.  
(1) Find the value of $p_0$. (Reference data: If $X \sim N(\mu, \sigma^2)$, then $P(\mu - \sigma < X \leq \mu + \sigma) = 0.6826$, $P(\mu - 2\sigma < X \leq \mu + 2\sigma) = 0.9544$, $P(\mu - 3\sigma < X \leq \mu + 3\sigma) = 0.9974$)  
(2) A passenger transport company uses two models of vehicles, A and B, for long-distance passenger transport services between locations A and B, with each vehicle making one round trip per day. The passenger capacities of models A and B are 36 and 60, respectively, and the operating costs from A to B are 1,600 yuan per vehicle for model A and 2,400 yuan per vehicle for model B. The company plans to form a passenger transport fleet of no more than 21 vehicles, with the number of model B vehicles not exceeding the number of model A vehicles by more than 7. If the company needs to transport all passengers from A to B each day with a probability of at least $p_0$ and aims to minimize the operating cost from A to B, how many vehicles of models A and B should be equipped?

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