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# GMAT: Math 11

61-64, pg. 160. Created by Sal Khan.

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• question #62 @11th edition; #64 @12th edition:

faster way is to multiply the three percentages first 1.10*1.05*0.90 = 1.03950
then because the value is only 10,000. move the decimal point 4 places to the right.
should take no more than 1 minute :)
• This was fast and I appreciate the alternate perspective. I think the key to speed is less in doing the arithmetic, and more in deciding how to attack the problem and being sure about it.
• FYI: #62 was presented incorrectly in the video, it should have been \$10,395 (I THINK)... When he moved the 11,550, he changed it accidentally to 11,500.
• Hi everyone, just a reminder, in problem number 62, as Sal mentioned in his clarification section under the video,
by mistake Sal wrote 11,500 x 0.9
it should be 11,550 x 0.9 and the answer 10,395.
• This didn't make sense at first, but now it makes sense! Thanks!
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