How many integers between 400 and 1000 are there such that their unit digit is odd? Choose the most appropriate option:
A) 250
B) 150
C) 300
D) 400
E) 450

Rationale: there are 600 numbers from 401 to 1000 ( inclusive ) . half of the numbers are odd , so there are 300 odd numbers . the answer is c .
Answer: C