Correct option (b) B
Explanation:
As per the question, A + B > C + D …..(i)
A + C = B + D ………(ii)
A = (B + D)/2
Or B + D = 2A …………………….(iii)
Putting value of (B + D) in (ii), we get:
A + C = 2A
Or A = C
Using (i), we get:
A + B > C + D
or B > D
As per equation (iii), A (or C) is the mean of the values of B and D. Hence, its value must fall between B and D.
Hence, B > A = C > D. So, B’s income is the highest.