A "Dictionary" originally priced at 120 yuan is now on sale at a 20% discount. How much is it cheaper than the original price?
一本《词典》原价120元，现打八折出售，比原价便宜多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">120 * (1/5)</gadget>
<output>24</output>

<result>24</result>