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Percent problem

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Master | Next Rank: 500 Posts
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by HPengineer » Mon Nov 08, 2010 10:03 pm
HOw can u solve this using smart value?

Certain stocks in January were 10% less then they were in Febuary and 20% greater then they were in March. What is the percent decrease in stocks from Febuary to March?

A.)5%
B.)20%
C.)25%
D.)40%
E.)50%
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by beat_gmat_09 » Mon Nov 08, 2010 10:59 pm
HPengineer wrote:HOw can u solve this using smart value?

Certain stocks in January were 10% less then they were in Febuary and 20% greater then they were in March. What is the percent decrease in stocks from Febuary to March?

A.)5%
B.)20%
C.)25%
D.)40%
E.)50%
Jan - 10% less than Feb = 90
Feb - 100 (Assume)
Mar - x

90 = 20% greater than march = 1.2x. Solve for x, x = 75.
(F-M/F)*100 = ((100-75)/100)*100 = 25% decrease.
Hence C.
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by HPengineer » Mon Nov 08, 2010 11:06 pm
thanks i clearly see my flaw now...

im about to post another percent problem... tell me your thoughts..
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by diebeatsthegmat » Tue Nov 09, 2010 7:01 pm
HPengineer wrote:HOw can u solve this using smart value?

Certain stocks in January were 10% less then they were in Febuary and 20% greater then they were in March. What is the percent decrease in stocks from Febuary to March?

A.)5%
B.)20%
C.)25%
D.)40%
E.)50%
first of all i was stuck on this problem because it says " greater than they were in march" i thought that greater number of stock in march compare to the number of stock in january thus i got stuck... now
ok...
suppose the february is 100
january=90% february so january is 90
the stock in feb compared to march=1,2 march or 90=1,2 march
so march = 75
thus (100-75)/75 =0,25%
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