A square is 400 cm long. After sawing it into two equal pieces, the surface area increases by 50 cm2 compared to the original one. Find the original volume and surface area of this square.
一根方料长400厘米，把它锯成相等的两段后，表面积比原来增加了50平方厘米，求这根方料原来的体积和表面积．
<gadget id="calculator">5 * 400 * 4</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 + 50</gadget>
<output>8_050</output>

<result>8_050</result>