
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
Square corners, 7 units on one side, are cut from each corner of a 35 unit by 50 unit rectangular sheet of cardboard. The remaining edges are then folded upwards to form an open-top box. Calculate the surface area, in square units, of the interior of the box.
A) 746 square units
B) 756 square units
C) 766 square units
D) 776 square units

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