A digital camera is now priced at 3780 yuan, 420 yuan less than the original price, that is, how much lower than the original price.
一台数码相机现在售价3780元，比原价减少420元，也就是比原价降低多少．
<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>