There is a trapezoidal steel plate, the upper base is 1.2 meters, the lower base is 1.75 meters, and the height is 0.8 meters. If the steel plate weighs 24.5 kg per square meter, how much does the steel plate weigh?
有梯形钢板一块，上底1.2米，下底1.75米，高0.8米．如果每平方米钢板重24.5千克，这块钢板重多少千克？
<gadget id="calculator">1.2 + 1.75</gadget>
<output>2.95</output>

<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">2.95 * 0.4</gadget>
<output>1.18</output>

<gadget id="calculator">24.5 * 1.18</gadget>
<output>28.91</output>

<result>28.91</result>