What is the value of 10 percent of y?

Question

(1) 5 percent of y is 60.
(2) y is 80 percent of 1,500.

Source:

mcelroytutoring · Accepted Answer

Here is a visual that should help.

HardWorkBeatsAll · Answer

(1) Percentages are linear. If 5% is 60, 10% is 120. Sufficient.
(2) Y is 80% of 1500. So, Y is 1500/0.8. So, 10% of Y is 0.1*1500/0.8. Sufficient.

Hence, (D).

avigutman · Answer

Video solution from Quant Reasoning:
 https://www.youtube.com/watch?v=JdQsGGiBem8

ranaazad · Answer

Statement 1: 1/20 * y = 60
Statement 2: y = 1500 * 4/5

Each statement is sufficient. Hence D. :D

BrentGMATPrepNow · Answer

Target question :    What is the value of 10 percent of y?

Statement 1 : 5 percent of y is 60  
If 5 percent of y is 60, then  10 percent of y is 120  
Since we can answer the  target question  with certainty, statement 1 is SUFFICIENT

Aside: we can keep going with this logic. 
For example, if 5% of y is 60 then 0.5% of y is 6 
and 50% of y is 600
and 15% of y is 180
and 20% of y is 240
and 25% of y is 300
etc...

Statement 2 : y is 80 percent of 1,500  
So, y = 80/100 of 1500
In other words, y = (0.8)(1500)
Since we COULD determine the value of y, we COULD then find the  value of 10 percent of y 
Since we COULD answer the  target question  with certainty, statement 2 is SUFFICIENT

Answer: D

masterofwordz · Answer

5% of y is 60.
10% is representing the double the value which is 120.
For the second statement,80% of 1500=1200,therefore 10% of the value is 120.
Both statements are sufficient.

Sent from my iPhone using GMAT Club Forum

EMPOWERgmatRichC · Answer

Hi All,

This DS question is designed with some great concept 'shortcuts' - meaning that you don't need to do any actual math to answer this question (as long as you recognize the concepts involved).

We're asked for the value of 10% of Y.

1) 5% of Y = 60

This is one variable with one equation (with nothing special - such as exponents), meaning that you CAN solve it (and there will be just one answer). If you chose to solve it, you'd have...

.05(Y) = 60 
Y = 1200

As it is, you don't have to do that work if you recognize the Algebra concept involved here. 
Fact 1 is SUFFICIENT

2) Y is 80% of 1500

Again, we have the same concept as in Fact 1 (above) - one variable and one equation.... so we know it's SUFFICIENT. Here's the proof though:

Y = (.8)(1500) 
Y = 1200 
Fact 2 is SUFFICIENT

Final Answer:  D

GMAT assassins aren't born, they're made, 
Rich

GMATinsight · Answer

Answer: Option D

Video solution by  GMATinsight

https://www.youtube.com/watch?v=K5bZ1Z27gqs

ScottTargetTestPrep · Answer

Solution:

Question Stem Analysis:
 
We need to determine the value of 10 percent of y.

Statement One Alone:

Since 5 percent of y is 60, then 10 percent of y must be 120. Statement one alone is sufficient.

Statement Two Alone:

Since y is 80 percent of 1,500, then y = 0.8 x 1,500 = 1,200. Therefore, 10 percent of y is 120. Statement two alone is sufficient.

Answer: D

RobertVericPrep · Answer

When you see data sufficiency questions you always want to ask yourself, "What is the question behind the question?" In other words, "What do I need to know in order to answer the question?"

In order to answer this question, you simply need to know the value of y.

Statement 1 -
If you write an equation, yes, you could I find the value of y. 
(.05) y = 60 
You don't need to take the time to solve for y, you just need to know, looking at the equation, that you COULD solve for y. Statement is 1 sufficient

Statement 2 -
Similar story.
2y = (.8)*1,500 
You could you find the value of y.

Each statement gives you sufficient information to answer the question

Answer D

What is the value of 10 percent of y?

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GMAT Data Sufficiency (DS) Questions

What is the value of 10 percent of y?

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