A part of monthly expenses of a family is constant and remaining varies with the price of wheat. When the rate of wheat is Rs. 250 per quintal, the total monthly expenses of the family are Rs. 1000 and when it is Rs. 240 per quintal, the total monthly expenses are Rs. 980. The total monthly expenses of the family when the cost of wheat is Rs. 350 per quintal are

• A. Rs. 850
• B. Rs. 900
• C. Rs. 1050
• D. Rs. 1200