The price of each piece of a commodity is 330 yuan. If you sell it at 20% off the price, you can still make a profit of 10%. What is the purchase price of each piece of this commodity?
某商品每件的标价是330元，按标价的八折销售时，仍可获利10%，则这种商品每件的进价为多少元．
<gadget id="calculator">1 + 0.1</gadget>
<output>1.1</output>

<gadget id="calculator">264 / 1.1</gadget>
<output>240</output>

<result>240</result>