A trapezoidal orchard has an upper base of (1/5) km, a lower base of (3/10) km, and a height of (1/8) km. What is the area of the orchard in square kilometers?
一块梯形果园，上底是(1/5)千米，下底是(3/10)千米，高是(1/8)千米．这个果园的面积是多少平方千米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/5) + (3/10)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) / 2</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/2) * (1/16)</gadget>
<output>1/32 = around 0.03125</output>

<result>1/32 = around 0.03125</result>