1/4 + 1 = 1.25?

Thanks everyone for this quarter of a century (1/4) plus (+) one (1). Doing maths this is 1.25. It is amazing what we can do with simple algebra and arithmetics or that's what Google suggests. That's much better than this.

Death By Chocolate (12 servings)
Ingredients (Google units converter)

8 oz (225 g) dark semisweet chocolate (40-50% cocoa)
2/3 cup (140 g) butter
1 cup (210 g) sugar
4 eggs
4 heaped tablespoons (1 dl) all-purpose flour
4 tablespoons unsweetened cocoa powder
1½ teaspoon baking powder or 1 teaspoon baking soda
1 teaspoon vanilla extract
4 tablespoons sour cream
Ingredients for frosting
2/3 cup (1.6 dl) heavy cream or whipping cream
9 oz (260 g) semisweet chocolate (40-50% cocoa)

Method
1. Preheat oven to 350 deg F (Gas mark 4 or 180 deg C).
2. Line a circular 10 inch (25 cm) cake tin (3 inches tall) with greaseproof or other non-stick paper and grease the tin. (Please note that the cake will rise to 3 inches and collapse somewhat when cooled. If your cake tin is less than 10 inches wide and 3 inches tall we recommend that you use two cake tins.)
3. Break the chocolate into small pieces and melt it with butter over hot water.
4. Beat the eggs with sugar, mix with flour, cocoa powder, baking powder and vanilla extract.
5. Slowly fold in the melted butter and chocolate and the sour cream.
6. Bake at 350 degrees until a wooden pick inserted in center comes out clean, approximately 50 minutes.
7. Cool the cake. Remove the crusted surface on the top of the cake, and cut in half, horizontally.

Frosting
1. Heat 2/3 cup (1.6 dl) of heavy cream or whipping cream in a sauce pan.
2. Remove from heat, add 9 oz of finely chopped dark semisweet chocolate, stir until smooth, and let it cool until in thickens.
3. Use one 1/3 of the frosting between the two layers, 1/3 on top, and the rest around the cake. Put the cake into the fridge for one hour or more to harden the frosting.
4. This cake should have room temperature when served.

Variations
1. You may add 3 tablespoons of rum to the chocolate and butter mixture.
2. You can add chopped walnuts and decorate with whole walnuts for a marvelous nutty treat!