The status of this response is Pending and require some modification by the author.
There are no Windows 10 Tablets under 15000 INR. The final version of Windows 10 OS will b released in the first half of 2015. Currently, only the Technical Preview of Windows 10 Operating System is available for downloading on your desktop or laptop. After receiving all feedback for Windows 10 TP and resolving all Windows 10 TP bugs, Microsoft would launch the Windows 10 OS final version next year.
So, you will have to wait for few months before you can purchase any tablets running Windows 10 OS.
Thanks & Best Regards,