Hello Anne, here's a recipe that I think would work for you.

Quick mix sponge

This recipe is suitable for a 20 x 30 cm rectangular cake tin or two 23 cm round cake tins or a 20cm deep square cake tin.

250g soft margarine
250g caster sugar
4 eggs beaten
250g self raising flour
3,75ml baking powder
30ml hot water

Preheat oven 180 degrees celsius and prepare cake tin/s

Place all ingredients in to mixer's bowl and beat for 2 - 3 minutes until light and fluffy.
Spoon into tin/s and bake for 25 - 30 minutes, until golden and firm to the touch.
Allow cake/s to cool for a few minutes in tin/s and turn out to cool completely on wire cooling rack.

The recipe is very simple and a good one for anyone who's new to baking. The cake keeps for about 4 - 5 days but does gradually dry out due to the extra baking powder.
Let me know how it turned out.

Red Ribbon