After the price of a computer is reduced by 25%, the price is 3660 yuan, how much is the price reduced.
一台电脑降价25%后，售价是3660元，则降了多少元．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">3_660 / (3/4)</gadget>
<output>4_880</output>

<gadget id="calculator">4_880 * (1/4)</gadget>
<output>1_220</output>

<result>1_220</result>