The price of a sweater is 51 yuan, which is 17 yuan lower than the original price. How much is the price reduction?
一件毛衣售价51元，比原来降价17元，降价了百分之几？
<gadget id="calculator">51 + 17</gadget>
<output>68</output>

<gadget id="calculator">17 / 68</gadget>
<output>1/4 = around 0.25</output>

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