After a stockholder bought 2,000 shares of a certain stock at 10.5 yuan per share, he sold them all at 13.75 yuan per share. In this process, no matter whether he buys or sells, he needs to pay 0.3% of the transaction amount as a handling fee. How much money does this investor make by buying and selling this stock?
一个股民以每股10.5元买进某股票2000股后，又以每股13.75元全部卖出．此过程中无论是买进还是卖出他均需缴纳交易额为0.3%作为手续费，这位股民买卖这种股票赚了多少钱？
<gadget id="calculator">0.3 / 100</gadget>
<output>0.003</output>

<gadget id="calculator">1 - 0.003</gadget>
<output>0.997</output>

<gadget id="calculator">13.75 * 2_000 * 0.997</gadget>
<output>27_417.5</output>

<gadget id="calculator">1 + 0.003</gadget>
<output>1.003</output>

<gadget id="calculator">10.5 * 2_000 * 1.003</gadget>
<output>21_063</output>

<gadget id="calculator">27_417.5 - 21_063</gadget>
<output>6_354.5</output>

<result>6_354.5</result>