There is a cone-shaped pile of sand for sale in the gravel yard. The circumference of the bottom is 18.84 meters and the height is 4.5 meters. If the sand is sold for 20 yuan per cubic meter, and Uncle Wang is going to buy this pile of sand to build a new house, how much will he pay?
沙石场有一堆圆锥形的沙子出售，底面周长是18.84米，高是4.5米，如果每立方米沙子卖20元，王大伯准备买下这堆沙子盖新房子，他应付多少元？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 4.5 * 20</gadget>
<output>847.8</output>

<result>847.8</result>