how to filter woocommerce products based on discount wise?

I work my first WordPress eCommerce store.i want to product filter based on discount.i use woo-commerce product filter but i confused how to make discount wise filtration in my store.

like UPTO 10%
     10%-20%
     20%-30%
     -------
     -------
    more 50%

http://screencast.com/t/sNRvMFrtxVe

thanks