piece of clothing is priced at 150 yuan. After bargaining, Xiao Zhang sells it for 120 yuan and can earn 20%. If it is sold at the original price, what is the profit rate?
一件衣服标价150元，小张讨价还价后，以120元成交，还可赚20%，如果以原价售出，利润率为多少
<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">120 / (6/5)</gadget>
<output>100</output>

<gadget id="calculator">150 - 100</gadget>
<output>50</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>