After a coat was sold at a price of 240 yuan, it just made a profit of 20%. How much is the cost of this coat?
一件上衣以240元的标价卖出后，刚好赚了20%．这件上衣的本钱是多少元？
<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">240 / (6/5)</gadget>
<output>200</output>

<result>200</result>