A piece of triangular glass has a base of 12.5 decimeters and a height of 8 decimeters. The price per square decimeter of glass is 0.6 yuan. How much does it cost to buy this piece of glass?
一块三角形的玻璃，它的底边是12.5分米，高是8分米，每平方分米玻璃的价钱是0.6元，买这块玻璃要多少元？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">12.5 * 4 * 0.6</gadget>
<output>30</output>

<result>30</result>