
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 certain hospital is preparing to purchase two types of masks, $A$ and $B$. The unit price per box of type $A$ masks is $50$ yuan more than the unit price per box of type $B$ masks. The number of boxes of type $A$ masks that can be purchased with $2000$ yuan is the same as the number of boxes of type $B$ masks that can be purchased with $1500$ yuan. Find the unit price per box of type $B$ masks.

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