The price of a down jacket in August is 400 yuan, and the price in December is 450 yuan. What is the price increase?
一件羽绒服8月份的价钱是400元，12月份卖450元，其涨价幅度是多少．
<gadget id="calculator">450 - 400</gadget>
<output>50</output>

<gadget id="calculator">50 / 400</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>