A piece of brown glass is parallelogram with a base length of 1.56m and a height of 1.2m. If the price per square decimeter is 0.75 yuan, how much will it cost to buy this piece of glass?
一块平行四边形的茶色玻璃，底长1.56m，高1.2m．如果每平方分米的价格是0.75元，买这块玻璃要用多少钱？
<gadget id="calculator">1.56 * 10</gadget>
<output>15.6</output>

<gadget id="calculator">1.2 * 10</gadget>
<output>12</output>

<gadget id="calculator">15.6 * 12 * 0.75</gadget>
<output>140.4</output>

<result>140.4</result>