Rent perquisite

The employer is giving both HRA and rent for the employee? or only HRA or rent @ 7500/- p.m.?

If it is HRA, then lower of :

rent paid - 10% of salary or

HRA actually received or

40% (50% in case of metro cities) of salary, shall be exempted for computation of income tax.

You have to clarify whether rental accomodation is provided by the employer or not. 

In a case where the accommodation is taken on lease or rent by the employer, the value of perquisite of rent free accommodation shall be the actual amount of lease rental paid or payable by the employer or 20% of salary whichever is lower as reduced by the rent if any, actually paid by the employee. In respect of rent free furnished accommodation, the value of perquisite as determined shall be further increased by 10% per annum of the cost of furniture including television sets, radio sets, refrigerators, other household appliances, air- conditioning plant or equipment or other similar appliances or gadgets if owned by the employer or if such furniture is hired from a third party, by the actual hire charges payable for the same as reduced by any charges paid or payable for the same by the employee during the previous year.