Tickets for Xiangjiang Safari Park are 100 yuan for adults and 50 yuan for children. On Children's Day, to celebrate Children's Day, children's tickets are free, so the number of adults entering the park increased by 60% compared with the previous day, and the number of children entering the park increased by 80%, resulting in a total increase of 780 people. But this day's ticket income is the same as the previous day's income. So, how much is the ticket revenue of the zoo on June 1st?
香江野生动物园的门票，大人100元，儿童50元．六一儿童节这天，为了庆祝儿童节，儿童门票免费，这样大人入园者比前一天增加了六成，儿童入园者增加了八成，结果共增加了780人．但这天门票收入和前一天收入相同．那么，六一节这天动物园的门票收入是多少元？
<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) * 100</gadget>
<output>80_000</output>

<result>80_000</result>