# GMAT OFFICIAL GUIDE DS – A clothing store acquired an item…

## Solution:

We are given that a clothing store acquired an item at a cost of x dollars and sold the item for y dollars. We must determine:

(profit/cost) * 100 = ?

We are given x as the cost and y as the revenue. Thus, profit = revenue – cost = y – x, and thus we can substitute y – x for profit and x for cost. Thus, our new question is:

(y – x)/x * 100 = ?

Statement One Alone:

y – x = 20

Since y – x = 20, we can substitute 20 for y – x into the expression (y – x)/x * 100.

The new question is: 20/x * 100 = ?

Since we do not know the value of x, statement one alone is not sufficient. We can eliminate answer choices A and D.

Statement Two Alone:

y/x = 5/4

When we cross multiply y/x = 5/4 we obtain:

4y = 5x

(4/5)y = x

0.8y = x

Since 0.8y = x, we can substitute 0.8y for x in the expression (y – x)/x * 100.

(y – 0.8y)/(0.8y) * 100 = ?

(0.2y)/(0.8y) * 100 = ?

(0.2/0.8) * 100 = ?

(1/4) * 100 = 25%

Statement two is sufficient.