If a 7 cm cube is cut into 1 cm cubes, then what is the percentage increase in the surface area of the resulting cubes?  Choose the correct choice.
A) 140%	B) 350%	C) 450%	D) 600%	E) 700%
The area A of the large cube is 7*7*6= 
<gadget id="calculator">7*7*6</gadget>
<output>294</output>
294 square cm.   The area of the 343 small cubes is 7*7*7*6= 7A, an increase of 600%.   The answer is 600%.
<result>D</result>
If a 7 cm cube is cut into 1 cm cubes, then what is the percentage increase in the surface area of the resulting cubes?