The ticket price of the aquarium is 80 yuan each. If there are many people going, it is more cost-effective to buy a group ticket. There are 45 students in the third grade, and the total price of buying a group ticket is 3240 yuan. How much cheaper can each person be?
水族馆的门票价格是每张80元，如果去的人多，购买团体票比较合算，三年级有45人去游玩，购买团体票共付了3240元，每人可以便宜多少元？
<gadget id="calculator">3_240 / 45</gadget>
<output>72</output>

<gadget id="calculator">80 - 72</gadget>
<output>8</output>

<result>8</result>