A barrel of cooking oil weighs 9.5kg, and after half of it is used, the weight of the barrel is 5.5kg. If cooking oil costs 3.20 yuan per kilogram, how much is the price of this barrel of cooking oil?
一桶食用油连桶重9.5kg，用去一半后，连桶重5.5kg．如果每千克食用油3.20元，这桶食用油售价是多少元？
<gadget id="calculator">9.5 - 5.5</gadget>
<output>4</output>

<gadget id="calculator">4 * 2 * 3.2</gadget>
<output>25.6</output>

<result>25.6</result>