The base of a parallelogram is 25 cm and the height is the base (4/5). What is its area?
一个平行四边形的底25厘米，高是底的(4/5)．它的面积是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (4/5) * 25</gadget>
<output>500</output>

<result>500</result>