rxs0005 wrote:

During a 3 year period, the profits of company X changed by what percent form the second year to the third year

(1) The increase in profits of company X from first year to the second year was the same as the increase from the first year to the third year

(2) For company X the profits for first year = 13000$ and for 3rd year = 15900$

let's start with statement (2): It's clearly not sufficient, as we don't have any information about the 2nd year.

(1) This one is tricky. Either you solve this one conceptually (see the solution provided by Bunuel) or using algebra:

Profits1st year=x

2md year = y

3rd year = z

Percent change1st - 2nd year:\(\frac{y-x}{x}\)

1st - 3rd year:\(\frac{z-x}{x}\)

And both changes are equal:\(\frac{y-x}{x}=\frac{z-x}{x}\), just do the required manipualtions and you'll get y=z, hence 0% change Sufficient

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