The original price of a household appliance is 800 yuan. After the price is reduced by 10%, it is still 20% more than the cost. What is the cost of this household appliance?
一种家用电器原价是800元，降价10%后，仍比成本多20%，这种家用电器的成本是多少元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(9/10) / (6/5)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">800 * (3/4)</gadget>
<output>600</output>

<result>600</result>