Teacher Bi bought 8 basketballs and 1 football for the school, and spent a total of 500 yuan. It is known that the unit price of football is 60 yuan, how much is the unit price of basketball?
毕老师为学校购买了8个篮球和1个足球，共花去500元．已知足球的单价是60元，篮球的单价是多少元？
<gadget id="calculator">500 - 60</gadget>
<output>440</output>

<gadget id="calculator">440 / 8</gadget>
<output>55</output>

<result>55</result>