Question: how much baking powder for 1 kg cake?
Answer: 8.3 multiplied by 0.25 is 2.075, so let's round it to 2 (2 teaspoons), (8.3*0.25=2.075). In metric this is 10g if salt. So for 1kg of flour you will need 45g baking powder (4 tablespoons) of baking powder and 10g (2 teaspoons) of salt.