Data Sufficiency

DS Practice test question

D should be the correct ans

I would choose B.

First analyse the question stem. Lets translate the words into variables and equations.
Let c = cost, s = sell price, and p = profit. We know that profit is sale price minus the cost.
So we can write p = s - c.

20 coats were purchased = 20(c)
20 coats were sold = 20(s)
So total profit = 20(s) - 20(c) = 20(s-c)

Lets look at statement 1:

(1) This can be expressed as:
20(2s-c) = 2400
2s-c = 120
We are not able to get s-c from this. INSUFF.

(2) This can be expressed as:
20[(s+2)-c] = 440
(s+2)-c = 22
s+2-c = 22
s-c = 20
We now have s-c ... so can work out the total profit from here. 20(s-c) = 20(20) = 400

Choose B.

II wrote:I would choose B.


Lets look at statement 1:

(1) This can be expressed as:
20(2s-c) = 2400
2s-c = 120
We are not able to get s-c from this. INSUFF.

STATEMENT I : selling price is twice the price of cost

if cost = x
selling = 2x

therefore 20 (2x-x) = 2400
from there u can get x - so

Statement I is SUFF

California4jx wrote:

II wrote:I would choose B.


Lets look at statement 1:

(1) This can be expressed as:
20(2s-c) = 2400
2s-c = 120
We are not able to get s-c from this. INSUFF.

STATEMENT I : selling price is twice the price of cost

if cost = x
selling = 2x

therefore 20 (2x-x) = 2400
from there u can get x - so

Statement I is SUFF

Where in statement 1 does it mention anything about "cost" ? It states "if the selling price is twice as much" ... this is referring to the selling price.

I agree with II

whats the OA ?