The price of edible oil last year was 10.8 yuan per kilogram, and this year the price has increased by 50% compared with last year. How much more expensive is the price of edible oil this year than last year?
食用油的价格去年是每千克10.8元，今年比去年提价50%，今年食用油的价格比去年贵多少元？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10.8 * (1/2)</gadget>
<output>5.4</output>

<result>5.4</result>