choclate cake in 100 Rupees

ingredients
Oil - 1/4 cup Or 50 ml (8.5 rs , Brand is Patanjali sunflower oil)
Powdered Sugar - 1 cup or 196gm (7.8 rs , from Local shop )
Coffee Powder - 1tsp (2 Rs, brand is Nescafe)
Water - Free
All Purpose Flour/ Maida - 1.5 cup or 213 gm (10.65 Rs , Fortune )
Cocoa Powder - 1/4 cup or 20 gm ( 25 Rs , Brand is Weikfield)
Baking Powder - 1 tsp ( 1 Rs , Brand is Weikfield )
Baking Soda - 1/4 tsp (30 paisa , Brand is Weikfield)
A pinch of salt (10 paisa , Brand is Tata )
Vinegar - 3 tsp or 15 ml (80 paisa, From local brand )
Dark Compound Chocolate - 100 gm (27 Rs, Brand is Morde)
Cream - 50 gm (14 Rs , Brand is Amul)