The original price of a commodity is 50 yuan, and it is sold at a 5% discount. How much is the current price cheaper than the original price?
一种商品原价是50元，按九五折出售．现价比原价便宜了多少元．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50 * (1/20)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>