The whole class of 36 people went to the park to play. The "Ticket Purchase Instructions" at the entrance of the park wrote: Each person enters the gate with a ticket. Children's tickets are 8 yuan each. Group discounts can be enjoyed from 40 tickets, and tickets are purchased at 80% of the original price. Do the math, how to buy the least money? How much is the minimum?
全班36人去公园游玩，公园门口的"购票须知"写道：每人凭票进门，儿童票每张8元，40张开始可享受团体优惠，按原价的80%购票．算一算，怎样购买花钱最少？最少要多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 * 8 * (4/5)</gadget>
<output>256</output>

<result>256</result>