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Problem in Percentage

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Problem in Percentage

by phoenix9801 » Tue Jun 15, 2010 2:25 am
I need some clarification of the 2 problems please. If you can explain step-by-step instruction I would appreciate it. be simple in your solution and the best way to solve...



1- In a poll of 66,000 physicians, only 20 percent responded; of these, 10 percent disclosed their preference for pain reliever X. How many of the physicians who responded did not disclose a preference for pain reliever x?



2- The Price of a certain television set is discounted by 10 percent, and the reduced price is then discounted by 10 percent. This series of successive discount is equivalent to a single discount of ..
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by kvcpk » Tue Jun 15, 2010 2:29 am
Problem1

There are 66000 physicians.
So 20 percent of them is 13200, 10 percent of these is 1320.
so 1320 voted for X. therefore, 13200-1320 voted against X.
=11880
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by kvcpk » Tue Jun 15, 2010 2:32 am
When such problems are asked, take the total amount as 100.
after 10 percent discount, price is now 90.
again a 10 percent discount on 90 means 9.

So total 10+9 = 19 rupees discount. this is for 100 ruppes.

So percent is 19.
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