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An electronic calculator is sold at a profit of 18% has it been sold for Rs 16 ,more the profit would have been 20%.Find the cost of calculator?



Let cost of calculator be x
The 18 % profit = 18x/100
If it was sold at Rs16 more the profit would be 20% i.e 20x/100
ATQ      20x/100-18x/100 =16
                             ⇒   x = 800
         Cost of calculator is Rs 800
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Let the cost price of the calculator be Rs.X
Selling price of the calculator at 18% gain={(100+gain%)/100 x CP}
=Rs.{(100+18)/100 x X}=Rs.(118X/100)
Selling price of the calculator at 20% gain={(100+gain%)/100 x CP}
=Rs.{(100+20)/100 x X}=Rs.(120X/100)
According to the question,
X=16 x 100/2
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