At least 8 cubes with a side length of 5 cm are needed to assemble a cube. By what percentage is the sum of the surface areas of the big cubes smaller than the original small cubes?
用棱长5厘米的正方体拼成一个正方体至少需要8个，拼成的大正方体比原来小正方体的表面积之和减少了百分之几？
<gadget id="calculator">5 * 5 * 6 * 8</gadget>
<output>1_200</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 10 * 6</gadget>
<output>600</output>

<gadget id="calculator">1_200 - 600</gadget>
<output>600</output>

<gadget id="calculator">600 / 1_200</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>