Agreed.

Start with 100(1.10) = 110
110(1.20) = 132

(Orig - New)/New = (100-132)/100 = 32/100 or 32%

But PR says the answer should be 24%. I don't get it.

IMO B

rabab and toudavis

going with ur values
Start with 100(1.10) = 110
110(1.20) = 132

current level is 132, old level 100

to bring 132 to 100 we have to reduce by 32

so 32 is how much percent of 132:
32/132 is approx 24%

mental wrote:IMO B

rabab and toudavis

going with ur values
Start with 100(1.10) = 110
110(1.20) = 132

current level is 132, old level 100

to bring 132 to 100 we have to reduce by 32

so 32 is how much percent of 132:
32/132 is approx 24%

I see. Thanks for the help!

Nothing to add here really - the explanation above (from mental) is fine. Start with 100 and then figure it out from there.

I did want to say, though, that this is a classic GMAT trap: tricking people into saying that the percent decrease from x to y would be the same as the percent increase from y to x (in this case, the percent decrease from 132 to 100 is not the same as the percent incresae from 100 to 132).

Be careful!

Thanks mental for the explanation and Rahab for posting the question !
tricky one


Vishu

imo:B