The price of edible oil is 23.8 yuan per kilogram this year, which is 40% higher than last year. How much more expensive is the price of edible oil this year than last year?
食用油的价格今年是每千克23.8元，比去年提价40%，今年食用油的价格比去年贵多少元？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">23.8 / (7/5)</gadget>
<output>17</output>

<gadget id="calculator">23.8 - 17</gadget>
<output>6.8</output>

<result>6.8</result>