Hi Bharat,

This DS question has some interesting "clues" built into it that will affect what the correct answer is.

We're told that there are Sedans and SUVs and that 1/6 of the Sedans were sold. This means that the TOTAL number of Sedans MUST BE a multiple of 6 (6, 12, 18, etc.). The number of SUVs can be any positive integer.

We're asked "did the dealership have more than 100 vehicles at the BEGINNING of the day?" This is a YES/NO question.

Fact 1: The dealership sold 8/9 as many Sedans as SUVs.

Let's TEST Values:
If 8 Sedans were sold and 9 SUVs were sold, then the dealership started with:

48 Sedans (since 1/6 were sold)
At least 9 SUVs, but we don't know how many

If it's 9, then 48 + 9 = 57 and the answer is NO
If it's 100, then 48 + 100 = 149 and the answer is YES.
Fact 1 is INSUFFICIENT

Fact 2: The dealership sold 85% as many Sedans on Tuesday as it did on Wednesday.

This is an INTERESTING piece of information that most people would mishandle.

85% = 17/20

So, we know that the number of Sedans is a MULTIPLE OF 6 AND a MULTIPLE OF 17.
The smallest possible number of Sedans would be 6 x 17 = 102

At that point, the number of SUVs is irrelevant.
102 + any positive integer > 100, so the answer to the question is ALWAYS YES.
Fact 2 is SUFFICIENT.

Final Answer: B

GMAT assassins aren't born, they're made,
Rich