New Delhi, May 4 -- A lot of people plan to accumulate funds for investment but find it difficult to save enough. It makes sense for such investors to save on a monthly basis. Recurring deposits (RD) account is the best option for such investors. An RD account can be opened with a bank or a Post Office. Both State Bank of India (SBI) and Post Office offer RD options to their customers. You can choose a fixed amount to invest every month over a period of time....