Uncle Li bought 4 kilograms of apples and 2 kilograms of pears in the mall, paid the salesperson 20 yuan, and got back 5.6 yuan, 2.5 yuan per kilogram of apples, how much is it per kilogram of pears?
李叔叔在商场买了4千克苹果和2千克梨，付给售货员20元，找回了5.6元，每千克苹果2.5元，每千克梨多少元？
<gadget id="calculator">4 * 2.5</gadget>
<output>10</output>

<gadget id="calculator">20 - 5.6 - 10</gadget>
<output>4.4</output>

<gadget id="calculator">4.4 / 2</gadget>
<output>2.2</output>

<result>2.2</result>