Tickets for a zoo usually cost 200 yuan for adults and 100 yuan for children. On the day of "Children's Day" Children's Day, children did not receive tickets. The number of adults entering the kindergarten increased by 60% compared with the previous day, and the number of children entering the kindergarten increased by 80% compared with the previous day, resulting in a total increase of 780 people. But the sum of ticket revenue is the same as the previous day. So, how much is the total ticket revenue on Children's Day?
平时某动物园的门票，大人200元，儿童100元．"六一"儿童节那天，儿童不收门票，大人进园的人数比前一天增加了6成，儿童进园的人数比前一天增加了8成，结果共增加了780人．但门票收入的总和与前一天相同．那么，儿童节那天门票收入合计多少元．
<gadget id="calculator">0.6 + 0.96</gadget>
<output>1.56</output>

<gadget id="calculator">780 / 1.56</gadget>
<output>500</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">500 * (8/5) * 200</gadget>
<output>160_000</output>

<result>160_000</result>