Xiao Ming bought 4 books and spent 10 yuan, how much will Xiao Gang need to spend when he wants to buy 8 of the same book
小明买了4个本花了10元，当小刚想买8个同样的本子时需花多少元
<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 8</gadget>
<output>20</output>

<result>20</result>