The price of a juicer is 91 yuan after the price increase (2/11). How much is the price of this juicer before the price increase?
一台榨汁机提价(2/11)后售价91元，这台榨汁机提价前售价多少元．
<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">1 + (2/11)</gadget>
<output>13/11 = around 1.181818</output>

<gadget id="calculator">91 / (13/11)</gadget>
<output>77</output>

<result>77</result>