store bought a batch of basketballs, bought them for 90 yuan, and sold them for 140 yuan. So, how much is the profit of each basketball.
商店进了一批篮球，买入时每个篮球花了90元，卖出时每个篮球售价140元．那么，每个篮球的利润是多少元．
<gadget id="calculator">140 - 90</gadget>
<output>50</output>

<result>50</result>