The supermarket sold 9 boxes of inflatable toy balls, 24 in each box, with a total income of 864 yuan. How much does each inflatable toy ball sell for?
超市卖出9箱充气玩具球，每箱24个，共收入864元．每个充气玩具球卖多少元？
<gadget id="calculator">864 / 9 / 24</gadget>
<output>4</output>

<result>4</result>