A notebook originally sold for 4 yuan, but now it sells for 3 yuan, how much is it cheaper than before?
一种笔记本原来售价4元，现在售价3元，比原来降价多少
<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>