The school went to the store to buy a small football for each class of 40 classes. Each football cost 30 yuan. The mall launched a promotional activity of buying four and getting one free. How much does it cost to buy these football schools?
学校到商店给40个班每班买一个小足球，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 * 1</gadget>
<output>40</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">40 * 24</gadget>
<output>960</output>

<result>960</result>