A laptop is now priced at 3,780 yuan, which is 420 yuan less than the original price. How much is the price reduction?
一台笔记本电脑现在售价3780元，比原价减小420元，减价百分之几？
<gadget id="calculator">3_780 + 420</gadget>
<output>4_200</output>

<gadget id="calculator">420 / 4_200</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>