A barrel of oil weighs 5 kilograms. After pouring out (1/5) of it, pour out another (1/5) kilogram. How many grams is this barrel of oil heavier than the original?
一桶油重5千克，倒出它的(1/5)后，又倒出(1/5)千克，这桶油比原来多少克．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 * 1_000 * (1/5)</gadget>
<output>1_000</output>

<gadget id="calculator">(1/5) * 1_000</gadget>
<output>200</output>

<gadget id="calculator">1_000 + 200</gadget>
<output>1_200</output>

<result>1_200</result>