This is the conceptual question from arithmetic progression chapter in which we are to calculate the savings of a man in the first month if he saved Rs.33000 in 10 months. In each month after the first, he saved Rs.100 more than he did in the preceding month.

Book RS Aggarwal, Class 10, chapter 5C, question no 46.

Hence, the money saved by the man in the first month is Rs.2,850.