If you have worked for only 10 days, proportionately deduct the PF qualifying salary to the salary payable for those ten days. For example, if your PF is calculated on Rs 16,000, consider this as the PF qualifying salary for 30 days and determine the amount for 10 days. This would naturally amount to Rs 5,333, and PF should be deducted at 12% of this Rs 5,333.
If your company caps your PF contribution at Rs 15,000, then the PF qualifying salary for 10 days would be Rs 5,000, and the contribution will be based on this amount of Rs 5,000.