Xiao Ming reads a story book. Those who read this book on the first day (3/10) read 8 pages less than the first day on the second day, and the remaining (1/2) of this book did not read it. Ask Xiao Ming What percent of the book was read the next day?
小明读一本故事书，第一天读这本书的(3/10)，第二天比第一天少读8页，还剩下这本书的(1/2)没有读，问小明第二天读了这本书的百分之几？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (3/10) - (1/2)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>