A barrel of oil weighs 9.5 kilograms. After half of it is removed, the weight of the barrel is 5.5 kilograms. It is known that oil costs 3.20 yuan per kilogram. How much can this barrel of oil be sold for?
一桶石油连桶重9.5千克，去一半后，连桶重5.5千克，已知每千克石油3.20元，这桶油能卖多少钱？
<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>