Cream sugar and margarine, add the eggs and beat well. Add the flour,baking powder and salt mixture then the 1/2 c warm milk. Add lastly the blueberries which have been tossed with 2 tblsp. of the flour. Put in a 9 in. greased and floured pan and sprinkle with the 1/4 c sugar mixed with the 1/4 tsp. cinnamon. Bake in 350 oven for 35 min.