If there is a 20% discount on a certain commodity, you will lose 150 yuan; if you discount 10%, you can make a profit of 100 yuan. How much is the purchase price of this commodity?
某商品如打八折，就要亏150元；如打九折，可获利100元，这件商品进价多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_500 * (4/5)</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 + 150</gadget>
<output>2_150</output>

<result>2_150</result>