a) Balance on 3rd Sept. = Rs. 2,700
Balance on 8th Sept. = Rs. 2,700 – Rs. 1,200 = Rs. 1,500
Balance on 17th Sept. = Rs. 1,500 + Rs. 500 = Rs. 2,000
Then minimum balance for the month of sept = Rs. 1,500 Ans
b) Balance on 7th Nov. = Rs. 750
Balance on 30th Nov. = Rs750 – Rs. 200 = Rs. 550
Then minimum balance for the month of Nov. = Rs. 550 Ans.