If you sell a piece of clothing for 120 yuan, you can earn 20%. If you want to earn 40%, what is the price?
一件衣服以120元卖出，可赚20%，如果要赚40%，应定价多少元．
<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">120 / (6/5)</gadget>
<output>100</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">100 * (7/5)</gadget>
<output>140</output>

<result>140</result>