The upper base of the trapezoid is 45 decimeters, the lower base is 20 decimeters more than 80% of the upper base, and the height is 20% of the upper base. What is the area of the trapezoid?
梯形的上底是45分米，下底比上底的80%多20分米，高是上底的20%，这个梯形的面积是多少？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">45 * (4/5)</gadget>
<output>36</output>

<gadget id="calculator">36 + 20</gadget>
<output>56</output>

<gadget id="calculator">45 + 56</gadget>
<output>101</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">45 * (1/5)</gadget>
<output>9</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">101 * (9/2)</gadget>
<output>909/2 = around 454.5</output>

<result>909/2 = around 454.5</result>