Mathematics · Data Sufficiency

A question is given followed by three statements numbered I, II, and III. Identify which of the statements is/are sufficient to answer the question. Question: What is the total expense when the hostel has 189 occupants? Statement: Total expenses of the hostel consist of two parts: one varies directly with the number of occupants and the other is fixed. I. When it had 150 occupants, its total expense was Rs. 79,500. II. When it had 240 occupants, its total expense was Rs. 1,15,500. III. When it had 200 occupants, its total expense was Rs. 99,000.