Any person starts investing in any scheme after seeing the profit. Some people are ready to take risks in the pursuit of profit, while some people like to invest in a place where their investment is completely safe and they get guaranteed profits. If you are also one of those investors who like to invest in schemes with safe and guaranteed returns, then you must keep a post office scheme in your portfolio. We are talking about Post Office Kisan Vikas Patra, this is a scheme which gives a guaranteed double return on your investment. Know all the benefits of this scheme.