gmatprep

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gmatprep

by mariah » Sat Oct 03, 2009 11:28 am
During a one day sale, a store sold each sweater of a certain type for 30$ more than the store's cost to purchase the sweater. How many sweaters were sold during the sale?

(1) During the sale, the total revenue from the sale of these sweaters was 270$
(2) During the sale, the store sold each of these sweaters at a price that was 50% greater than the store's cost to purchase each sweater.

OA is C.
store cost X
selling price x+30
number sweates sold Y

so revenue (prize - cost): y(30+x) - yx =270 ; 30y=270 ...hence a, what i am missing ??? pls explain
Source: — Data Sufficiency |

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Re: gmatprep

by schumi_gmat » Sat Oct 03, 2009 10:21 pm
mariah wrote:During a one day sale, a store sold each sweater of a certain type for 30$ more than the store's cost to purchase the sweater. How many sweaters were sold during the sale?

(1) During the sale, the total revenue from the sale of these sweaters was 270$
(2) During the sale, the store sold each of these sweaters at a price that was 50% greater than the store's cost to purchase each sweater.

OA is C.
store cost X
selling price x+30
number sweates sold Y

so revenue (prize - cost): y(30+x) - yx =270 ; 30y=270 ...hence a, what i am missing ??? pls explain
CP = x
SP = x+30
n = no of sweaters

i) 270 = n .SP

ii) SP = 1.5 CP = 1.5 x
x+30 = 1.5 x

x = 60

from i) n = 270/60

Ans C

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by mariah » Sun Oct 04, 2009 12:20 am
i got it , i think i have messed revenue and profit ?