If a computer is sold minus 30% of the price, the loss will be 1,000 yuan, and if it is sold minus 10% of the price, the loss will be 200 yuan. How much is the purchase price of this computer?
一台电脑如果减去定价的30%出售，则亏损1000元，如果减去定价的10%出售，则亏损200元．这台电脑的进货价是多少元？
<gadget id="calculator">1_000 - 200</gadget>
<output>800</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/10) - (1/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">800 / (1/5)</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 * (3/10)</gadget>
<output>1_200</output>

<gadget id="calculator">4_000 - 1_200</gadget>
<output>2_800</output>

<gadget id="calculator">2_800 + 1_000</gadget>
<output>3_800</output>

<result>3_800</result>