The original price of a commodity is 120 yuan. If it is sold at a 50% discount, how much is it cheaper to buy this commodity than the original price?
一件商品原价120元，如按五折出售，买这件商品比原来便宜多少元．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">120 * (1/2)</gadget>
<output>60</output>

<result>60</result>