Find the final amount of a monthly Recurring Deposit.
Each month's deposit earns interest for a different length of time — the first deposit compounds the longest, the last barely at all.
Maturity: Sum of each month's deposit, compounded for its own remaining time
How is an RD different from an FD?
An FD is one lump amount deposited just once. An RD is a series of equal monthly deposits — useful for building up savings little by little, instead of all at once.