Sieve maida, cocoa, baking powder and soda together.
Mix sugar, butter and condensed milk in a pan and beat well.
Add half of the sieved mixture and half of the cola to it and beat well.
Add the left over cola and the sieved mixture and beat well again.
Take a cake tin and grease it with butter.
Put butter paper according to its size and dust lightly with flour.
Bake it in a hot oven at 150ªC/300ªF for 35-40 minutes.
(If a knife is inserted in the center of the cakeand it comes out clean, remove from the oven after 5 minutes.)