The shape of a piece of glass is triangle, its base is 12.5dm, and its height is 7.8dm. The price of glass per square meter is 68 yuan. How much does it cost to buy this piece of glass?
一块玻璃的形状是三角形，它的底是12.5dm，高是7.8dm．每平方米玻璃的价钱是68元，买这块玻璃要用多少元？
<gadget id="calculator">7.8 / 2 / 100</gadget>
<output>0.039</output>

<gadget id="calculator">12.5 * 0.039 * 68</gadget>
<output>33.15</output>

<result>33.15</result>