In a public show 50 % of the seats were filled. If there were 600 seats in the hall, how many seats were vacant?
Choose the correct choice from the following answers
A) 100
B) 110
C) 120
D) 300
E) 150

Rationale: "50 % of 600 = 50 / 100 × 600 = 300 therefore , the number of vacant seats = 600 - 300 = 300 . answer : d"
Answer: D