The price of a certain commodity is 120 yuan, if it is sold at a 90% discount of the price and still makes a profit of 20% relative to the purchase price, what is the purchase price of the commodity?
某种商品的标价为120元，若以标价的90%降价出售，仍相对于进货价获利20%，则该商品的进货价是多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(9/10) / (6/5)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (3/4)</gadget>
<output>90</output>

<result>90</result>