After the price of a kind of clothing increases (1/5), the selling price is 120 yuan. How much is the original price of this dress?
一种服装涨价(1/5)后，售价为120元．这种服装原价是多少元？
<gadget id="calculator">1 / 5</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">120 / (6/5)</gadget>
<output>100</output>

<result>100</result>