The uncle buys back a batch of apples for 4,000 yuan, and then sells them at 115% of the purchase price. According to regulations, the uncle should pay taxes at 25% of the profits. How much tax should the uncle pay in this transaction?
叔叔用4000元购回一批苹果，然后按进价的115%出售，根据规定叔叔应按利润的25%交纳税款，叔叔在这次买卖中应交纳税款多少元？
<gadget id="calculator">115 / 100</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">4_000 * (23/20)</gadget>
<output>4_600</output>

<gadget id="calculator">4_600 - 4_000</gadget>
<output>600</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">600 * (1/4)</gadget>
<output>150</output>

<result>150</result>