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# In a promotional offer '3+1', a mobile company offers a mobile free on

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Math Expert
Joined: 02 Aug 2009
Posts: 7334
In a promotional offer '3+1', a mobile company offers a mobile free on  [#permalink]

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11 Mar 2018, 06:59
00:00

Difficulty:

25% (medium)

Question Stats:

70% (00:46) correct 30% (00:41) wrong based on 80 sessions

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In a promotional offer '3+1', a mobile company offers a mobile free on purchase of 3 mobiles. What is the discount?
(A) 25%
(B) 33.33%
(C) 66.66%
(D) 75%
(E) Insufficient data

New question - Chetan

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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
4) Base while finding % increase and % decrease : https://gmatclub.com/forum/percentage-increase-decrease-what-should-be-the-denominator-287528.html

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Re: In a promotional offer '3+1', a mobile company offers a mobile free on  [#permalink]

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11 Mar 2018, 08:21
let us take the cost of each mobile hundred.
Now for getting 4 mobile, we have to pay 300 only because one mobile is free.
Hence we get the product of 400 in the cost of 300 that means the discount is 100.
So the discount % is 100/400 * 100 = 25%.
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Joined: 26 Sep 2017
Posts: 97
Re: In a promotional offer '3+1', a mobile company offers a mobile free on  [#permalink]

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11 Mar 2018, 08:34
gmatbusters wrote:
let us take the cost of each mobile hundred.
Now for getting 4 mobile, we have to pay 300 only because one mobile is free.
Hence we get the product of 400 in the cost of 300 that means the discount is 100.
So the discount % is 100/400 * 100 = 25%.

I think we are not sure of prices whether all the product prices are same or not...so answer might be E...

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Intern
Joined: 12 Mar 2018
Posts: 2
Re: In a promotional offer '3+1', a mobile company offers a mobile free on  [#permalink]

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13 Mar 2018, 17:33
Well, the question doesn't say whether the mobile free is as same as the purchase ones, so the infos given are not sufficient to calculate the promotion.
Re: In a promotional offer '3+1', a mobile company offers a mobile free on   [#permalink] 13 Mar 2018, 17:33
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