How are banks calculating interest on savings accounts?

Late last year RBI deregulated the interest rates on savings accounts and allowed banks to set their own rates. This resulted in banks raising their interest rates and creating two slabs of under a lakh and over a lakh.

For example, Yes Bank offers 6% on the saving bank balance of under Rs. 1 lakh and 7% on balances of over a lakh. Similarly, Kotak pays 5.5% for balances of less than a lakh and 6% on balances of over a lakh.

Does anyone have practical experience with this or knows for certain how this is going to be calculated?