A certain kind of leather clothing in a store is difficult to sell. The shop owner calculates: If you sell it at 10% off the sales price, you can make a profit of 200, and if you sell it at 20% off, you will lose 150 yuan. What is the purchase price of this kind of leather clothing? ．
某商店的一种皮衣，销售有一定困难，店老板核算一下：如果按销售价打九折出售，可盈利200，如果打八折出售就要亏损150，那么这种皮衣的进价是多少元．
<gadget id="calculator">200 + 150</gadget>
<output>350</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(9/10) - (4/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">350 / (1/10)</gadget>
<output>3_500</output>

<gadget id="calculator">3_500 * (9/10)</gadget>
<output>3_150</output>

<gadget id="calculator">3_150 - 200</gadget>
<output>2_950</output>

<result>2_950</result>