In a bowl mix sugar and margarine until soft and fluffy

Add in the eggs one by one

And in the sieved flour and baking powder and mix well
It's should be a dropping mixture

Divide the mixture in 2
And add the cocoa powder to one of the mixture and mix well

Dust your baking tin with margarine and flour and pour the mixture

Put the baking tin/sufuria in a another big sufuria and cover well

If you're using a jiko/gas top use low heat
If it's an oven bake under 180° for 40 mins

Insert a skewer/toothpick to know if your cake is ready
If it's comes out clean it's ready
It's comes out with some mixture it's not