The Observer is a newspaper company that has two divisions

The Observer is a newspaper company that has two divisions: The East Observer and The West Observer. All the employees at The Observer work in either of the two divisions. For the past five years, The East Observer has consistently accounted for 40% of the total workforce of The Observer while The West Observer has accounted for the rest. Over the same period, The West Observer has accounted for 50% of the total wages paid by The Observer.

Which of the following can properly be inferred about the past five years from the statements above?

a) The distribution of people across different hierarchical levels is different in The East Observer than in The West Observer.
b) The average motivation level of employees working in the two divisions is different, even though the difference in number is not significantly large
c) The average revenue generated per employee is expected to be greater in The East Observer than in The West Observer.
d) The average wage paid to the workforce is greater at The West Observer than at The East Observer.
e) The number of people working at The East Observer is at least 25% less than the number of people working at The West Observer.

Please explain the answer. thanks