certain electrical appliance is sold at a price of 1,000 yuan in the first half of the month, and a total of 50 units are sold; in the second half of the month, the price is reduced by 5%, so that the sales increase by 20%, and the profit obtained is 500 yuan more than that in the first half of the month. What is the cost of each appliance? Yuan?
某种电器上半月按定价1000元的价格出售，共销售50台；下半月降价5%，这样销售增加了20%，所获利润比上半月多500元，这种电器每台的成本是多少元？
<gadget id="calculator">1_000 * 50</gadget>
<output>50_000</output>

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

<gadget id="calculator">1_000 * 50 * (1/5)</gadget>
<output>10_000</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1_000 * (1/20) * 50</gadget>
<output>2_500</output>

<gadget id="calculator">1_000 * (1/20) * 50 * (1/5)</gadget>
<output>500</output>

<gadget id="calculator">10_000 - 2_500 - 500 - 50_000 - 500</gadget>
<output>-43_500</output>

<gadget id="calculator">50_000 + (-43_500)</gadget>
<output>6_500</output>

<gadget id="calculator">50 * (1/5)</gadget>
<output>10</output>

<gadget id="calculator">10 - 50</gadget>
<output>-40</output>

<gadget id="calculator">50 + (-40)</gadget>
<output>10</output>

<gadget id="calculator">6_500 / 10</gadget>
<output>650</output>

<result>650</result>