There is a batch of apples in the fruit shop. If they sell a batch of apples at 1.2 yuan per kilogram, they will lose 40 yuan. If they sell at 1.5 yuan per kilogram, they can earn 80 yuan. How much should a kilogram of apples be sold for?
水果店有一批苹果，若每千克卖1.2元，就会亏40元，若每千克卖1.5元，就能赚80元，为尽快卖出，老板决定降价出售，结果赚得40元钱，每千克苹果应以多少元出售．
<gadget id="calculator">80 + 40</gadget>
<output>120</output>

<gadget id="calculator">1.5 - 1.2</gadget>
<output>0.3</output>

<gadget id="calculator">120 / 0.3</gadget>
<output>400</output>

<gadget id="calculator">1.2 * 400</gadget>
<output>480</output>

<gadget id="calculator">480 + 40</gadget>
<output>520</output>

<gadget id="calculator">520 + 40</gadget>
<output>560</output>

<gadget id="calculator">560 / 400</gadget>
<output>7/5 = around 1.4</output>

<result>7/5 = around 1.4</result>