Posta has brought you a beneficial National Savings Certificate scheme. Its maturity is 5 years. You can withdraw the amount even after the maturity period of 1 year. You can start investing with just 100 rupees. It currently pays 7 percent interest per annum. If you invest Rs 15 lakh, you will get 7 percent interest. After 5 years you will get Rs 21 lakh more than Rs 20.85 lakh.