In simple terms, any employee who earns wages upto or less than 10,000 is eligible to get bonus.
Hence whoever is eligible, his bonus shall be calculated on 3500. But if he earns less than 3500,(suppose i.e 2400) then bonus shall be on that particular amount of 2400.
If it is minimum bonus then it shall be 3500*12*8.33%
If maximum bonus is to be given then 3500*12*20%
Allocable surplus in a very easy terms means a particular amount set aside for the bonus from the available surplus or profit the company has as per sec(10) of bonus act. That amount is given for giving maximum bonus 20% and rest is carried forward for the next year.
Hope this helps you.
Indu Nair
Student HR