let me add to your analysis.
To be able to survive on 30k a month, there are some basic things that need to be settled first.
You should be living in your own house and not paying rent. Because you cant save enough for a rent on 30k a month. The baseline is, you can't worry about paying rent when you are earning 30k per month.
Your working place should be a walkable distance from your house. You cant be worried about transportation to and from work, when you are earning such meagre sum.
You should have health insurance to cover any immediate medical needs that may arise. But since the medical insurance in Nigeria is crappy at best, then you can only hope and pray that a medical emergency doesn't come up.
Your wardrobe should be stocked. You cannot be worrying about clothes on 30k a month.
Once the above has been settled, you are left with food. With a well calculated formula and discipline you can survive on 30k a month.
But since youll have to be in utopia for all the above to align at the same time, then, well... I don't know.. Is there still hope?
RE: How to survive on 30000 Naira (65USD) per month.... sanity check and call for help.