A store sells some old goods as processed goods at a reduced price. If they sell them minus 5% of the price, they can make a profit of 430 yuan. If they sell them minus 25% of the price, they will lose 250 yuan. What is the purchase price of this kind of goods? ?
某商店把一些旧存的商品作为处理品降价出售，如果减去定价的5%出售，可盈利430元，如果减去定价的25%出售，亏损250元，这种商品购进价是多少元？
<gadget id="calculator">430 + 250</gadget>
<output>680</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) - (1/20)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">680 / (1/5)</gadget>
<output>3_400</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">3_400 * (19/20)</gadget>
<output>3_230</output>

<gadget id="calculator">3_230 - 430</gadget>
<output>2_800</output>

<result>2_800</result>