Ans. The sound system for cars can vary from around Rs. 7,000 to Rs. 20,000 depending on the model and manufacturer you choose to purchase from. There are a variety of infotainment system for cars available in the market with built-in Bluetooth speakers which allow wireless streaming of music from a mobile device. You will have to check brands and price comparisons before making your choice so that you don't miss out on any good deal.