There is a rectangular parallelepiped eraser, and it is cut into 2 pieces on average to get 2 cubes with a side length of 8 cm. At this point, the surface area increased by what percentage?
有一块长方体橡皮，把它平均切成2块，正好得到2个棱长为8厘米的正方体．此时，表面积比原来增加了百分之几？
<gadget id="calculator">8 * 8 * 2</gadget>
<output>128</output>

<gadget id="calculator">8 * 8 * 6 * 2</gadget>
<output>768</output>

<gadget id="calculator">768 - 128</gadget>
<output>640</output>

<gadget id="calculator">128 / 640</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>