There used to be a batch of rice in the grain station, which was sold (3/5), and another 1260 kilograms were shipped in. At this time, the rice in the grain station was 20% more than before. How many kilograms did this batch of rice originally have?
粮站原来有一批大米，卖出(3/5)，又运来1260千克，这时粮站里的大米比原来多20%，原来这批大米有多少千克？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/5) - (2/5)</gadget>
<output>-1/5 = around -0.2</output>

<gadget id="calculator">1 + (-1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_260 / (4/5)</gadget>
<output>1_575</output>

<result>1_575</result>