The school went to the store to buy 3 small footballs for each class of 40 classes. Each football costs 30 yuan. The shopping mall launched a promotional activity of buying four and getting one free. How much does it cost to buy these footballs?
学校到商店给40个班每班买3个小足球，每个足球要30元钱，商场为促销，推出了买四送一的优惠活动，买这些足球学校需要花多少钱？
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 * (4/5)</gadget>
<output>24</output>

<gadget id="calculator">120 * 24</gadget>
<output>2_880</output>

<result>2_880</result>