A company only produces ordinary cars and new energy vehicles. The company's new energy vehicles accounted for 10% of the total production last year. This year, due to the guidance of the national energy policy and the impact of rising oil prices, it plans to reduce the production of ordinary vehicles by 10% without maintaining the total volume. This year, new energy vehicles should increase. How many.
某公司只生产普通汽车和新能源汽车．该公司在去年的汽车产量中新能源汽车在总量的10%，今年由于国家能源政策的导向和油价上涨的影响计划将普通汽车的产量减少10%未保持总量，今年新能源汽车应该增加多少．
<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">(9/10) * (9/10)</gadget>
<output>81/100 = around 0.81</output>

<gadget id="calculator">1 - (81/100) - (1/10)</gadget>
<output>9/100 = around 0.09</output>

<result>9/100 = around 0.09</result>