If the expenditure of A and B in 1991 were equal and total income of A and B was Rs 116L what w...........

Explanation:

Explanation :
For A
40 = (I – E)*100/E
40E = (I – E)100
2E = 5I – 5E
5I = 7E
I = 7/5 E
For B
50 = (116-I – E)*100/E
E = 2(116 – I – E)
E = 232 -2I – 2E
2I = 232 – 3E
I = (232 – 3E)/2
7/5E = (-232 – 3E)/2
14E = 1160  – 15E
29E = 1160
E = 1160/29 = 40
2E = 80