The average income of A, B and C is Rs. 12,000 per month and average income of B, C and D is Rs. 15,000 per month. If the average salary of D be twice that of A, then the average salary of B and C is in Rs. :

• ক 8000
• খ 13500 ✅ সঠিক উত্তর
• গ 18000
• ঘ 9000