Payroll Outsourcing - what is the cost per employee for managing payroll if there are 100 employees?

NIOL
Dear Sir, I am managing a Payroll Outsourcing company for which I want to know what is the cost per employee for managing payroll if there are 100 employees.
The work would include managing PF, ESIC and all other statutory compliance of employee. The employee would work on my company's payroll.
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