How Much Did You Think It Will Cost To Build 4 Bedroom Bongalow?

Hi Nairalanders,
with ideas on building houses in Nigeria,please high light me on how much it will cost me to build a 4 bedroom Bongalow?

1.)   4 bedrooms
2.)   1 sitting room
3.)   1 dinner room
4.)   1 kitchen
5.)   3 bathrooms.

please ideas of price list from foundation to roofing and finishing.
Thanks.