Accrued interest on recurring deposit

My mother have opened a RD Accont for Rs.2000/- per month in post office last month,I want to know whether the interest accrued will be the total Interest payable on maturity divided by 5 years or in increasing manner.The maturity payable will be Rs.1,49,306/- after 5 years.

The interest in Post Office Recurrintg Deposit is quarterly compounded reinvested.