On the territory of India only state currency – rupees is accepted. You cannot pay with dollars, euros or rubles. The exception is major tourist areas (for example, Goa) where they accept foreign currency, but it is absolutely unprofitable for a tourist. A rupee consists of 100 paisa, but there is no money smaller than one rupee. Coins are in short supply in India, prepare for the fact that in the stores will round the price, especially for the “white” tourist. For 1 rupee you can be offered a candy, and for 5 – a piece of gum. The seller will always ask for change.