If a publishing house publishes a certain book, the cost of each book this year increases by 10% compared with last year, but the selling price remains the same, so the profit per book drops by 40%, then the percentage of the cost of this book in the selling price this year how many?
某出版社出版某种书，今年每册书的成本比去年增加10%，但售价不变，因此每本利润下降了40%，那么今年这种书的成本在售价中所占的百分数是多少？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(2/5) / (1/10)</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * (11/10)</gadget>
<output>22/25 = around 0.88</output>

<result>22/25 = around 0.88</result>