A has a house worth 300,000 yuan. When the house price drops by 10%, he sells it to B. After a period of time, the house price rises by 10%, and B sells it to A again. How much did A lose in total?
甲有一套价值30万元的住房，房价降低10%时，他卖给了乙，过了一段时间，房价上涨10%，乙又卖给了甲．甲总共损失多少钱？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">30 * (9/10)</gadget>
<output>27</output>

<gadget id="calculator">30 - 27</gadget>
<output>3</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">30 * (11/10)</gadget>
<output>33</output>

<gadget id="calculator">33 - 30</gadget>
<output>3</output>

<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<result>6</result>