What is the sum of all even numbers from 1 to 401? Choose the correct choice from the following answers:
A) 122821  B) 281228  C) 281199  D) 122850  E) 40200
40200xplanation:     400/2= 
<gadget id="calculator">  400/2</gadget>
<output>200</output>
200   200 * 201= 
<gadget id="calculator">200 * 201</gadget>
<output>40_200</output>
40200   Answer: 40200
<result>E</result>
What is the sum of all even numbers from 1 to 401?