A TV set costs 2,400 yuan, which is 40% cheaper than the price of a refrigerator. How much does a refrigerator cost?
一台电视机2400元，比一台电冰箱的价格便宜40%．一台电冰箱要多少元？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2_400 / (3/5)</gadget>
<output>4_000</output>

<result>4_000</result>