The original price of an electric fan is 100 yuan, the price is reduced by 20 yuan during the promotion period, and the price is increased by 10 yuan after the promotion is over. What percentage increase is the current price compared to the promotion price?
一种电扇原价100元，促销期间降价20元，促销活动结束后又涨价10元，现价比促销价涨价百分之几？
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">10 / 80</gadget>
<output>1/8 = around 0.125</output>

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