For a bookshelf, put 30% of the books on the first floor into the second floor, and the number of books on the second floor is exactly twice that of the first floor. Among the following statements, the correct one is how much more the second layer is than the first layer
一个书架，把第一层书的30%放入第二层，第二层书的本数正好是第一层的2倍．下列说法中，正确的是原来第二层比第一层多多少
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) * 2</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(7/5) - (3/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) - 1</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>