Adult tickets for the park are 10 yuan each, and children's tickets are 5 yuan each. Group tickets can be purchased for 20 or more people. When buying group tickets, adults and children will be charged 8 yuan per person. 15 adults bring 25 children into the park. How much does it cost at least when you go to the park.
公园成人门票每张10元，儿童票每张5元，20人及20人以上可买团体票，买团体票时不分成人和儿童按每人8元收费，15名成人带25名儿童进公园时，至少花多少元．
<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">160 + 100</gadget>
<output>260</output>

<result>260</result>