The original price of a mobile phone is 3,980 yuan each, but in the promotional activities held by the manufacturer, each phone is only sold for 2,985 yuan, which is equivalent to a discount? By what percentage was the price reduced?
一款手机原价是每部3980元，在厂家举办的促销活动中，每部只售2985元，相当于打几折销售？价钱降低了百分之几？
<gadget id="calculator">2_985 / 3_980</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(3/4) * 1</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

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