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All we have to do is realize that a $2,000 difference grew to a $2,440 when multiplied by P. This makes for a 22% increase and the information holds true for any two numbers $2,000 apart.

Answer is C. Right off the bat without doing any math.

Taken separately we don't know anything.

Taken together...

We know that their salaries grew further apart by $440. They started off in 1995 as $2,000 apart. That means the $440 increase must have come from the $2,000 difference.

No need to do the math on the real test. Just realize that you know how much their salaries started and that if there is any change in the difference it must've come from the original difference in salary.

All we have to do is realize that a $2,000 difference grew to a $2,440 when multiplied by P. This makes for a 22% increase and the information holds true for any two numbers $2,000 apart.

500,000*1.22 = 610,000 502,000*1.22 = 612,440

2,000*1.22 = 2440 4,000*1.22 = 4880

answer is definitely C.

I tested this method, and it works. I still can't visualize it. Oh well, I guess whatever works!

Try thinking of it like this.

We know that in 1995 Karen's salary was $2,000 greater than Jason's
We know that in 1998 Karen's salary was $2,440 greater than Jason's

Between 1995 and 1998 each of their salaries increased by the same percentage (P)

If Jason makes $10,000 and Karen makes $12,000 then we know that Jason's 10K and Karen's first 10K each increased by the same amount. They would be dead even in 1998 if Karen didn't make $2,000 more.

This means that Karen's $2,000 had to increase by $440 (to get to $2,440) all on it's own. So what percentage increase do you need for $2,000 to become $2,440? this is your answer. and that's why you can choose C without doing any math.

I'm not the best with explanations, but I hope this helps somewhat.

jason's salary & karen's salary were each P percent greater in 1998 then in 1995 what is the value of P?

a in 1995 karen's salary was $2000 greater then jason's

b in 1998 karen's salary was $2400 greater then jason's

Given: j_2=j_1(1+\frac{p}{100}) and k_2=k_1(1+\frac{p}{100}). Qurestion: p=?

(1) k_1-j_1=2,000. Not sufficient to calculate p. (2) k_2-j_2=2440. Not sufficient to calculate p.

(1)+(2) k_2-j_2=2440=k_1(1+\frac{p}{100})-j_1(1+\frac{p}{100}) --> 2440=k_1(1+\frac{p}{100})-j_1(1+\frac{p}{100})=(1+\frac{p}{100})(k_1-j_1)=(1+\frac{p}{100})2,000 --> 2440=(1+\frac{p}{100})2,000. Sufficient to to calculate p.

Or another way: difference between their salaries increased by 2440-2000=440, which is 440/2000*100=22%, but difference increases proportionally with the salaries, so increase in salary is also 22%.

Note that both of their salary increase by same p percent. In 1995 let jason's and karen's salary be j and k resp. And in 1998, let that be j1 and k1. j1 = pj k1 = pk

St 1 --> in 1995, k = j+2000 Not sufficient doesn't provide any info about 1998 year.

St 2--> in 1998, k1 = j1+2440 Not sufficient doesn't provide any info about 1995 year.

Both together, solve the equations - k1 = pk j1+2440 = p(j+2000) j1+2440 = j1+p2000 --> p = 12.2

A, Alone: K = J + 2000. Insuff
B alone: K (1 +P/100) = J(1 + P/100) + 2440. Insuff.

Together, we have three unknowns and two equations, we can't solve the equations. We must know at least one of either Janson's or Karen's salary in 1995 in order to solve for P.

OA is C. but the way i saw this, the difference of 440 didn't make any sense to me. I thought C is possible ONLY if the 2 people have the exact same salary from the beginning. but we don't even know that. a 5% increase on a salary of $10 will not yield the same as a salary of $100. that's why i picked E. both could yield different dollar amounts, but both have the same percentage increase. but after looking at the explanation, i guess if this works, then so be it. i never realised you could get to such an answer by only having the gaps between the 2 actually amounts. cool

Since question asks for the comparison between 1995 and 1998 salaries, a quick look at the statements will tell you that neither alone is sufficient. Now the question remains whether together they are sufficient. Let's analyze.

In 1995: J salary - J; K salary - J + 2000

In 1998: (Their salaries are now p% greater) J salary- J + p% of J; K salary- (J + 2000) + p% of (J + 2000)= J + p% of J + 2000 + p% of 2000

Compare the salaries in red. According to second statement, their difference is 2440. So we can say p% of 2000 = 440. On solving, we get p = 22 _________________

Re: Percents : Jason's salary and karen's salary were P % [#permalink]
23 Apr 2013, 03:38

My answer is C In 1995 Jason's salary J. In 1998 it would be (1+p/100)*J In 1995 Karen's salary K. In 1998 it would be (1+p/100)*K Stmt 1 : K= J+2000 in 1995. We dont know about either of their salaries in 1998. Hence insufficient

Stmt 2: (1+p/100)K=(1+p/100)J + 2440. We dont know the values of J and K . Hence insufficient.

combining. let (1+p/100)= a . a*(j+2000) = a*J +2440.

and we can solve for a or (1+p/100) and we can find the value of P.

Re: Janson's salary and Karen's salary were each p percent [#permalink]
13 May 2013, 12:03

In DS questions you can simply test whether you can find a percentage change from a percent change in differing values by picking values.

Say: A = 200 B = 100 Difference is 100.

Increase values by 10%:

A = 220 B = 110 Difference: 110. 110 is a 10% increase from the original difference, so this will also hold for the original values in the question stem.

Re: Janson's salary and Karen's salary were each p percent [#permalink]
25 May 2014, 09:57

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