A square log is 3 meters long and has a cross-sectional area of 25 square decimeters. Now saw it into equal pieces, sawed 4 times, how much does the cross-sectional area increase?
一根方木，长3米，横截面积是25平方分米．现在把它锯成相等的小段，锯了4次，横截面积增加了多少？
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">25 * 8</gadget>
<output>200</output>

<result>200</result>