There are 55 students from class 2 of the sixth year to see the "Chang'e" No. 1 model exhibition. The ticket office of the exhibition hall says "personal ticket 5 yuan, group ticket 20% discount" (20% discount is 80% of the ticket price), this How to buy tickets for the class is the most cost-effective, and how much does it cost?
六年2班有55名同学去看"嫦娥"一号模型展，展览馆的售票处写着"个人票5元，团体票8折优惠"(8折也就是票价的80%)，这个班该怎样买票才能最合算，共需要多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">55 * 5 * (4/5)</gadget>
<output>220</output>

<result>220</result>