This is an important question from the Book- ML Aggarwal
This question has been asked in 2008 questions paper
David opened a Recurring Deposit Account in a bank and deposited Rs. 300 per month for two years. If he received Rs. 7725 at the time of maturity, find the rate of interest per annum
Question no.6 , ML Aggarwal, exercise 2, chapter 2, ICSE board, class10, banking.