The correct option is A 21,575 grams
We know that 1kg = 1000 grams
6kg = 6000 grams and
15kg = 15000 grams
Total weight of sugar = 6kg 300 grams = 6000+ 300 = 6300 grams
Total weight of rice = 15kg 275 grams = 15,275 grams
Total weight = 6300 + 15,275 = 21,575 grams
Total weight which Gopi purchased is 21,575 grams.