Data Sufficiency (DS) | Re: What percent of b is a? (1) (b - a)b = 2/5 (2) b = 50

We need to know a/b or b/a to determine what percentage of b is a.

(1) (b-a)/b = 2/5
This statement gives us information about a/b and thus, we can determine what percentage of b is a.
SUFFICIENT

(2) b=50
We don't know a and hence, we can't determine what percentage of b is a.
NOT SUFFICIENT.

Final answer is (A)

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