Hi Mangala,
Please note that the bonus is to be paid to those whose basic is up to 10,000/-. The calculation should be done on 3500/- only. The minimum is 8.33%, and the maximum is 20% as per the act. Also, note that in the case of a person whose basic is 5000/-, you have to calculate on 3500/- only.
If a person's basic is more than 3500/- and there is a loss of pay, then you have to proportionately reduce it to 3500/-. For example, if an employee's basic is 6000/- and in the month of March, he had LOP for 3 days, then you have to calculate 3500/- divided by 31 days (March month). It will be 3161/-. On Rs. 3161, you have to calculate a bonus of 8.33%, which will work out as Rs. 263/- for that month.
The bonus calculation is on a financial year basis, i.e., from 1st April to 31st March.
I hope this clears your doubts.
Prabhakar Rao.M