The monthly incomes of A and B are Rs. 12000 and Rs. 15000 respectively. The monthly expenditure of A is Rs. 8000. If the ratio of the monthly expenditures of A and B is 2 : 3, then what is the sum of their monthly savings?
1
Rs. 7000
2
Rs. 5000
3
Rs. 6000
4
Rs. 8000
5
Rs. 9000