If the price of a commodity is reduced by 10% for two consecutive times, the selling price is 486 yuan. How much is the selling price before the price reduction?
一种货物，连续两次均以10%的幅度降价后，售价为486元，则降价前的售价为多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * (1/10)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(1/100) - (1/10) - (1/10)</gadget>
<output>-19/100 = around -0.19</output>

<gadget id="calculator">1 + (-19/100)</gadget>
<output>81/100 = around 0.81</output>

<gadget id="calculator">486 / (81/100)</gadget>
<output>600</output>

<result>600</result>