number of employees are 20 without power or 10 with power, ( recently they have decided to put registration on 10 without power also)
this no is obligatory for registration without contribution eligibility fact, some employees may have exempted, but for count they are eligible.
in wages / salary computed for ESI purpose, basic + DA+ food allwances are taken in account.
contribution is 1.75% from employees and 4.75% from employers