Teacher Li bought 6.5 kilograms of apples in the fruit shop, paid the salesperson 50 yuan, and got back 34.4 yuan. How much is each kilogram of apples?
李老师在水果店里买了6.5千克的苹果，付给售货员50元，找回34.4元，每千克苹果多少元？
<gadget id="calculator">50 - 34.4</gadget>
<output>15.6</output>

<gadget id="calculator">15.6 / 6.5</gadget>
<output>2.4</output>

<result>2.4</result>