Hello- I have had a hard time finding any direction on this box fill question. Any help will be much appreciated. The questions reads:

I have a 4 x 1 1/2" square box with (4) 14-2's, (1) 14-3 with separate cable clamps. If I add a 4 x 1 1/2" extension how many 12-2's can be added?

A. 0

B.1

C.2

D.3

*** how do you calculate the cubic inches of the extension if it is not listed? Do you double the box size of the original box being it is the same size? Or can you not use it because the cu in is not listed?

Any direction would be helpful. Thanks!

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