A TV set is a yuan, and the price is reduced by 15%. What is the current price?
一台电视机a元，降价15%，现价是多少元．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>