A trader allows a discount of 18% on the marked price of an article. How much percentage above the cost price must he mark it so as to get a profit of 6.6%?
Let the cost price be Rs.100.
Profit = 6.6% = 6.6
Selling price = 100 +Â 6.6 = Rs.106.6
Discount = 18%
Let the the marked price be 100%.
Selling price = 100 - 18 =Â 82%
106.6 = 82%
100%(marked price) = $$\frac{106.6}{82} \times 100$$ = 130
Percentage above the cost price must he mark = $$\frac{130 - 100}{100} \times 100 = 30$$%
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