There is a piece of parallelogram glass with a base of 15 decimeters and a height of 20 decimeters. It costs 68 yuan per square meter of glass. How much does it cost to buy this piece of glass?
有一块平行四边形的玻璃，它的底是15分米，高是20分米，每平方米玻璃需要68元，买这块玻璃要用多少钱？
<gadget id="calculator">15 / 10</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">(3/2) * 2 * 68</gadget>
<output>204</output>

<result>204</result>