Chicken in a food supermarket used to sell at 40 yuan per kilogram. Due to the impact of H7N9 bird flu, the price per kilogram of chicken is now 25% lower than the original price. How much is the price of chicken per kilogram in the supermarket now?
某食品超市鸡肉原来每千克售价40元，受H7N9禽流感的影响，现在每千克鸡肉的售价比原来降价25%．该超市现在每千克鸡肉售价多少元？
<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">40 * (3/4)</gadget>
<output>30</output>

<result>30</result>