Question 720366
That's a confusing question. 
{{{ 4*12*8 = 384 }}}
So, I guess they want 2 different boxes whose 
volumes are 20% more than the given box
{{{ 384 + .2*384 = 1.2*384 }}}
{{{ 1.2*384 = 460.8 }}}
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I think the thing to realize here is that if you
multiply any one of the 3 dimensions of the 
original box by {{{ 1.2 }}}, you will get a
volume that is 20% larger, so
{{{ 8*1.2 = 9.6 }}}
4 x 12 x 9.6 is a possible box
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{{{ 12*1.2 = 14.4 }}}
4 x 14.4 x 8 is a possible box
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{{{ 4*1.2 - 4.8 }}}
4.8 x 12 x 8 is a possible box
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Note all 3 give volume = 460.8 in3