A single discount equivalent to the discount series of 20%, 15% and 10% is?
Choose the correct choice:
A) 31.8 B) 31.1 C) 38.8 D) 31.2 E) 31.9
Explanation:   100*(80/100)*(85/100)*(90/100)= 
<gadget id="calculator">100*(80/100)*(85/100)*(90/100)</gadget>
<output>306/5 = around 61.2</output>
61.2   100 - 61.2= 
<gadget id="calculator">100 - 61.2</gadget>
<output>38.8</output>
38.8   Answer: 38.8
<result>C</result>
A single discount equivalent to the discount series of 20%, 15% and 10% is?