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The price of a certain product increased by the same percent

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The price of a certain product increased by the same percent [#permalink]

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The price of a certain product increased by the same percent from 1960 to 1970 as from 1970 to 1980. If its price of $1.20 in 1970 was 150 percent of its price in 1960, what was its price in 1980?

a) $ 1.80
b) $ 2.00
c) $ 2.40
d) $ 2.70
e) $ 3.00

Please provide explanations! Thanks
[Reveal] Spoiler: OA

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Re: The price of a certain product increased by the same percent [#permalink]

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New post 04 Sep 2013, 03:06
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fozzzy wrote:
The price of a certain product increased by the same percent from 1960 to 1970 as from 1970 to 1980. If its price of $1.20 in 1970 was 150 percent of its price in 1960, what was its price in 1980?

a) $ 1.80
b) $ 2.00
c) $ 2.40
d) $ 2.70
e) $ 3.00


The price in 1970 was 150 percent of its price in 1960, means that the percent increase was 50% from 1960 to 1970 (and from 1970 to 1980).

Therefore the price in 1980 = $1.2*1.5 = $1.8.

Answer: A.
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Re: The price of a certain product increased by the same percent [#permalink]

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New post 04 Sep 2013, 03:12
fozzzy wrote:
The price of a certain product increased by the same percent from 1960 to 1970 as from 1970 to 1980. If its price of $1.20 in 1970 was 150 percent of its price in 1960, what was its price in 1980?

a) $ 1.80
b) $ 2.00
c) $ 2.40
d) $ 2.70
e) $ 3.00

Please provide explanations! Thanks



Let the price in 60's be x
In 1970s the price is $1.2

as per Q, x* 150/100= 1.2

And as the percent increase in price is same so in 1980's the price will be 1.2*150/100= $1.8
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Re: The price of a certain product increased by the same percent [#permalink]

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New post 19 Nov 2013, 15:27
1.20 - 150%
X - 100%

X = (1.20*100%)/150% → x = 0.80

0.80 + (Y/100)*0.80 = 120 → Y = 50/100 = 50%

Z = 1.20*1.5 = 1.80

IMO A

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Re: The price of a certain product increased by the same percent [#permalink]

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Re: The price of a certain product increased by the same percent   [#permalink] 13 Oct 2017, 09:07
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