Mom gave Xiaoqing 11.10 yuan to buy 5 catties of bananas and 4 catties of apples. As a result, he reversed the quantities he bought, leaving 0.60 yuan left. What is the price of apples per catty?
妈妈给小青11.10元，让他去买5斤香蕉、4斤苹果，结果他把买的数量给弄颠倒了，从而还剩0.60元，问苹果每斤的售价是多少？
<gadget id="calculator">5 * 0.6</gadget>
<output>3</output>

<gadget id="calculator">11.1 - 3</gadget>
<output>8.1</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">8.1 / 9</gadget>
<output>0.9</output>

<result>0.9</result>