The books of school A are 150% of those of school B. By what percentage are the books of school A more than that of school B?
甲校的图书是乙校的150%，甲校比乙校的图书多百分之几？
<gadget id="calculator">150 / 100</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) - 1</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>