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If y is decreased by 20% and then increased by 60%, what is

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jlgdr
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If y is decreased by 20% and then increased by 60%, what is [#permalink] New post   20 Sep 2013, 17:18
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If y is decreased by 20% and then increased by 60%, what is the new number, expressed in terms of y?

A. 0.28y

B. 0.60y

C. 0.80y

D. 1.28y

E. 128y
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Bunuel
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Re: If y is decreased by 20% and then increased by 60%, what is [#permalink] New post   20 Sep 2013, 17:29
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jlgdr wrote:
If y is decreased by 20% and then increased by 60%, what is the new number, expressed in terms of y?

OA is
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1.28


x = y*0.8*1.6 = 1.28y.
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Re: If y is decreased by 20% and then increased by 60%, what is [#permalink] New post   02 Oct 2019, 14:21
if y is decreased by 20% and then increased by 60%, what is the new number, expressed in terms of y?
Solution:
let x= number after increase then decrease
let y= initial value
x=(y(1-0.2))(1+0.6)
x=(y*(.8))*(1.6)
x=1.28y
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Re: If y is decreased by 20% and then increased by 60%, what is [#permalink] New post   05 Oct 2019, 16:47
Expert Reply
jlgdr wrote:
If y is decreased by 20% and then increased by 60%, what is the new number, expressed in terms of y?

OA is
Show Spoiler
1.28


The new number is y x 0.8 x 1.6 = 1.28y.

Alternate Solution:

Assume y = 100. After the 20% decrease, the new value is 100 x 0.8 = 80. Then, after the 60% increase, the new value is 80 x 1.6 = 128. Thus, the new value is 1.28 times the original value of y, so we express the new value as 1.28y.

Answer: 1.28y
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Re: If y is decreased by 20% and then increased by 60%, what is [#permalink] New post   14 Aug 2022, 04:28
the new number is y x 0.8 x 1.6 = 1.28y.
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Re: If y is decreased by 20% and then increased by 60%, what is [#permalink]
14 Aug 2022, 04:28
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