A 1.8m long rectangular parallelepiped wooden stick has a cross-section of a square with a side length of 5cm, and the weight of the wooden stick per cubic decimeter is 8.9kg. How many kg does this wooden stick weigh in total?
一根长1.8m的长方体木条，横截面是边长5cm的正方形，每立方分米木条重8.9kg，这根木条共重多少kg？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1.8 * 10</gadget>
<output>18</output>

<gadget id="calculator">(1/2) * (1/2) * 18 * 8.9</gadget>
<output>40.05</output>

<result>40.05</result>