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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
66% (02:11) correct
34%
(02:34)
wrong
based on 101
sessions
History
Date
Time
Result
Not Attempted Yet
Bakery Z sells cookies for $7.20 a dozen. Bakery Y has a sale on the same cookies for $5.00 for the first 10 and $.80 a cookie after that. How many cookies could you buy from Bakery Y before the price exceeds that of Bakery Z?
(A) 10
(B) 15
(C) 18
(D) 20
(E) 25
(A) 10
(B) 15
(C) 18
(D) 20
(E) 25
Archit3110
Major Poster
16 May 2023, 08:28
Kudos
Bookmarks
cost per cookie at Bakery Z is $.6
How many cookies could you buy from Bakery Y before the price exceeds that of Bakery Z?
plug in options
at15
Z bakery cost $9 and that of Y $5 + $.8 * 5 ; $9 ;
at 18
Z bakery cost is $10.8 and that of Y $5+ (8*.8) ; $11.4
option B is correct
How many cookies could you buy from Bakery Y before the price exceeds that of Bakery Z?
plug in options
at15
Z bakery cost $9 and that of Y $5 + $.8 * 5 ; $9 ;
at 18
Z bakery cost is $10.8 and that of Y $5+ (8*.8) ; $11.4
option B is correct
aungthet
16 May 2023, 10:11
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Bookmarks
aungthet
So In Z each cookie costs - $ 0.6
And in Y = $5 for 10 , So cost of 12 in Y -> 5+ 0.8*2 = $ 6.6
In Z cost is $ 7.2
Hence 0.6 $ is the diff for breakeven. 0.6 = n(0.8-0.6) = > n=3
So need 3 more cookies on top of a dozen.
IMO 15 (B)
