Last year, for every 100 million vehicles that traveled on a certain highway, 75 vehicles were involved in accidents. If 6 billion vehicles traveled on the highway last year, how many of those vehicles were involved in accidents? (1 billion = 1,000,000,000)	Choices
A) 2500
B) 4500
C) 3500
D) 4000
E) 1300

Rationale: "to solve we will set up a proportion . we know that “ 100 million vehicles is to 75 accidents as 6 billion vehicles is to x accidents ” . to express everything in terms of “ millions ” , we can use 6,000 million rather than 6 billion . creating a proportion we have : 100 / 75 = 6,000 / x cross multiplying gives us : 100 x = 6,000 * 75 x = 60 * 75 = 4500 answer : b"
Answer: B