A single discount equivalent to the discount series of 20%, 15% and 5% is?  Select.
A) 31.5 B) 31.8 C) 31.6 D) 35.4 E) 31.1
100*(80/100)*(85/100)*(95/100)= 
<gadget id="calculator">100*(80/100)*(85/100)*(95/100)</gadget>
<output>323/5 = around 64.6</output>
64.6   100 - 64.6= 
<gadget id="calculator">100 - 64.6</gadget>
<output>35.4</output>
35.4   Answer:35.4
<result>D</result>
A single discount equivalent to the discount series of 20%, 15% and 5% is?