Tickets for the New Century Amusement Park used to be 30 yuan each, with a 20% discount during the "June 1st" period. How much can you save by buying a ticket?
新世纪游乐场的门票原来每张30元，"六一"期间八折优惠，购买一张门票能省多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 * (1/5)</gadget>
<output>6</output>

<result>6</result>