Answers

2015-11-06T23:04:39+05:30
C here m confused whether the cost is for the dealer or the customer. If it is for customer then 10% of 220 will be subtracted from the marked price. And if here cost price for dealer is asked then the sum will be continued from ur subtraction which will give u ur ans 98 and then as dealer had again gained 10% of 98 then the ans is the subtracted amount.
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Sorry I couldn't be able to help you
2015-11-07T00:06:35+05:30
Marked price of the book = Rs 220
Discount = 10%
Discount price =  10% of 220 = 10/100 * 220 = Rs 22
Price after discount = Selling price = Rs (220 - 22) = Rs 198
Now, Let the cost price be x
Gain = 10%
Gain price = 10% of x = 10/100 * x = x/10
A/q,
Selling Price = Cost price + Gain Price
=> 198 = x + x/10
=> 198 = (10x + x)/10
=> 1980 = 11x
=> 11x = 1980
=> x = 1980/11
=> x = 180
Therefore, the cost price is Rs 180

I HOPE IT WILL HELP YOU.......

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Hmm got it