If a product is sold with a 30% discount, it will lose 200 yuan, and if it is sold with a 10% discount, it will make a profit of 100 yuan. How much is the purchase price of this item?
一件商品打七折出售就会亏损200元，如果打九折出售就赚100元．这件商品的进价是多少元？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1_500 * (7/10)</gadget>
<output>1_050</output>

<gadget id="calculator">1_050 + 200</gadget>
<output>1_250</output>

<result>1_250</result>