The original price of an e-book is 500 yuan, but now it is reduced to 350 yuan. How much is the reduction?
一种电子书原价为500元，现在降低到350元，降低了百分之几？
<gadget id="calculator">500 - 350</gadget>
<output>150</output>

<gadget id="calculator">150 / 500</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>