Number of 9 between 100−199=10 Number of 9 between 200−299=10 Number of 9 between 300−399=10 Number of 9 between 400−499=10 Number of 9 between 500−599=10 Number of 9 between 600−699=10 Number of 9 between 700−799=10 Number of 9 between 800−899=10 Number of 9 between 900−999=200 Hence, total =280