
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, each 6 units on a side, are removed from a $25$ unit by $35$ unit rectangular sheet of cardboard. The sides are then folded up to form an open box. Calculate both the surface area, in square units, of the interior of the box and its volume.
A) Surface Area: 700 sq units, Volume: 1800 cu units
B) Surface Area: 731 sq units, Volume: 1790 cu units
C) Surface Area: 731 sq units, Volume: 1794 cu units
D) Surface Area: 750 sq units, Volume: 1800 cu units
E) Surface Area: 800 sq units, Volume: 1900 cu units

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