Find the average of first 40 natural numbers?  Choose the correct choice from the following choices:
A) 12.6 B) 20.5 C) 22.9 D) 30.5 E) 32.1
Sum of first n natural numbers = n(n+1)/2   sum of first 40 natural numbers = 40*41/2= 
<gadget id="calculator">40*41/2</gadget>
<output>820</output>
820   average= 820/40= 
<gadget id="calculator">820/40</gadget>
<output>41/2 = around 20.5</output>
20.5   Answer is 20.5
<result>B</result>
Find the average of first 40 natural numbers?