Directions: Study the table carefully to answer the questions that follow :
NUMBER OF WORKERS WORKING FOR SIX MONTHS IN VARIOUS FACTORIES(NUMBER IN HUNDREDS)
Q. What is the difference between the total number of workers working in various months from factory A and the total number of workers working in various months from factory E?
a)
3540
b)
3940
c)
3290
d)
4230
e)
None of these
Correct answer is option 'A'. Can you explain this answer?