Plese let me know Neira 90,000 Per month is good salary.
Can a person meet his necessary food & other expenses (bachelor) with this amount in Nigeria.

depending on where you want to live and the incentives attached,its a poor salary

If housing is free,then i think its okay

Before you take any job offer ask your self these questions

Do u currently have a job?
Is the offer salary better than my current job salary (If yes to 1)
Can the salary effectively cover the following
Transportation and feeding?
What ever the case is,except its Industrial Training, your job must be able to cover this

Housing?
Depends. If u leave with your relations then this is not mandatory for a first job with experience. But you have to remember that with time u will have to get ur own place

Is there opportunity for growth/experience?
This is important for every job

So 90k, well if u take out daily transport of 500 to 1000 that will make approx 22000 a month (22 working days in a month)
Feeding (break fast and lunch) 400to 600 daily will make approx 13000

Then ask, is the salary gross or net. For gross u will have to take out income tax, leave allowance, etc
income tax (17 % approx) will make approx 15,000
Leave allowance approx 5,000


5,000
15,000
13,000
22,000
=======
55,000
=======

That will leave you will appox 35k monthly

its ok if you dont have to pay rent cos the cheapest you will get for rent is about 20k per month or 240 per annum for about a 2 bedroom. If you get some one to share with then it comes to 10k per month

You also need to get the money in bulk to pay for one year (most cases its 2 yrs except you are leaving there before)

Finally, with leaving in your own house, you need to look at bills, feeding and all that.

So consider your situation and the offer and always remember you have to start from somewhere.

Hope this analysis helps.

All the best