Just search for Kindle Unlimited and you will find details of the subscription. The first 30 days are free. After that trial period, the subscription service is renewed at a cost of Rs 169 per month. You will need to enter your debit or credit card details on Amazon, so that the auto-charge can be applied each month.
Furthermore, how much is Kindle Unlimited for 6 months?
Shop: Kindle Unlimited (6 Months), $29.97 For New Members (Orig. $59.94) Users of Kindle Unlimited often pair the service with an Amazon Kindle device, like the one pictured below. However, the service works with any e-reader-enabled device, including an iPad, a smartphone or even a laptop or desktop computer.