A single discount equivalent to the discount series of 20%, 10% and 5% is?  Select
A) 11.1% B) 20% C) 45.8% D) 10.5% E) 31.6%
Option 31.6%   31.6%xplanation:   100*(80/100)*(90/100)*(95/100)= 
<gadget id="calculator">100*(80/100)*(90/100)*(95/100)</gadget>
<output>342/5 = around 68.4</output>
68.4   100 - 68.4= 
<gadget id="calculator">100 - 68.4</gadget>
<output>31.6</output>
31.6
<result>E</result>
A single discount equivalent to the discount series of 20%, 10% and 5% is?