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Senior Manager
Affiliations: UWC
Joined: 09 May 2012
Posts: 362
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)

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27 May 2012, 08:55
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00:00

Difficulty:

45% (medium)

Question Stats:

65% (01:59) correct 35% (02:17) wrong based on 60 sessions

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A certain bakery only sells bread. It sells bread at a regular price throughout the day, but decreases its price by y percent after 6 pm. Today, the bakery sold 300 loaves of bread. Did the bakery make more than \$1450 today?

(1) y = 60
(2) Fully priced loaves of bread cost \$12.50 each.
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Affiliations: Project Management Professional (PMP)
Joined: 30 Jun 2011
Posts: 137
Location: New Delhi, India

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27 May 2012, 22:47
macjas wrote:
A certain bakery only sells bread. It sells bread at a regular price throughout the day, but decreases its price by y percent after 6 pm. Today, the bakery sold 300 loaves of bread. Did the bakery make more than \$1450 today?

(1)y = 60

(2)Fully priced loaves of bread cost \$12.50 each.

Good Q

let n(A) be number of bread sold before 6PM and p(A) be proce of each such bread, Similarly, let n(B) be number of bread sold post 6PM and p(B) be proce of each such bread.
also n(A)+n(B)=300
p(B)=(1-y%)*p(A)
=> n(A)*p(A)+(300-n(A))*(1-y%)*n(A)

so three unknowns are there n(A), y & p(A)

statement 1: y= 60%, but we donot know other 2 variables=> not sufficient
Statement 2: p(A)=\$12.50, but we donot know other 2 variables=> not sufficient

1+2=> y=60% & p(A)=\$12.5
=> p(B)= (1-0.6)*12.5= 5\$

even if p(A)=0=> p(B)=300
total sale= 300*5=\$1500> \$1450, hence SUFFICIENT

Ans: C
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Vaibhav

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Senior Manager
Affiliations: UWC
Joined: 09 May 2012
Posts: 362
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)

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27 May 2012, 22:57
This one tricked me and is a very good example of how elegantly tricky (re: not hard) some GMAT problems are. Overall, the Princeton review questions are mostly in the 500-650 range IMO but they do have a few gems like this one where you need to use common sense!
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Joined: 02 Sep 2009
Posts: 52387

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28 May 2012, 03:26
1
You don't really need several variables to solve this question.

A certain bakery only sells bread. It sells bread at a regular price throughout the day, but decreases its price by y percent after 6 pm. Today, the bakery sold 300 loaves of bread. Did the bakery make more than \$1450 today?

(1) y = 60. Clearly insufficient.
(2) Fully priced loaves of bread cost \$12.50 each. If all 300 loaves of bread were sold before 6PM then the bakery would made more than \$1450 but if all 300 loaves of bread were sold after 6PM for \$1 then the bakery made less than \$1450. Not sufficient.

(1)+(2) The price of the loaf of bread after 6PM is \$12.50*(1-0.6)=\$5. Now, even if all 300 loaves of bread were sold after 6PM the bakery would still made \$5*300=\$1,500>\$1,450. Sufficient.

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Joined: 02 Jun 2018
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05 Sep 2018, 02:34
Even if all the 300 loaves were sold at 60%off that is \$5, total amount is 1500.

In this 60%is from statement 1

Base price is from statement 2

Hence both together is needed

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Re: A certain bakery only sells bread. It sells bread at a &nbs [#permalink] 05 Sep 2018, 02:34
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