Aunt Wang wants to install a mirror on the wall of the living room. The length of the mirror is 40 decimeters and the width is 25 decimeters. This mirror costs 96 yuan per square meter. How much does it cost to buy this mirror?
王阿姨想在客厅的墙上安装一面镜子，镜子的长是40分米，宽是25分米．这面镜子每平方米需要96元，买这面镜子共花多少元钱？
<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">25 / 10</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 * (5/2) * 96</gadget>
<output>960</output>

<result>960</result>