The price of a desk is 100 yuan, and the price of a chair is (2/5) of the desk. How much is the price of a set of desks and chairs?
一张课桌的价格是100元，椅子的价格是课桌的(2/5)．一套课桌椅的价格是多少元？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 * (2/5)</gadget>
<output>40</output>

<gadget id="calculator">40 + 100</gadget>
<output>140</output>

<result>140</result>