The purchase price of a toy airplane in a toy store is 40 yuan, and it is finally sold at a price of 56 yuan. What is the profit margin on this toy airplane?
玩具店的一架玩具飞机的进价是40元，最后以56元的价格卖出．这架玩具飞机的利润率是多少？
<gadget id="calculator">56 - 40</gadget>
<output>16</output>

<gadget id="calculator">16 / 40</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(2/5) * 1</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>