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An article is sold at a discount of 10% and a profit of 20% is made.
If the cost price of the article is $3600, find its marked price.
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Let x be its marked price.
From the condition, the article was sold ar the discounted price of 0.9x and the profit was 20% of the cost price.
So, the profit was 0.2*3600 = 720 dololars.
It gives this equation
0.9x - 3600 = 720 dollars.
From the equation, x = = 4800 dollars.
ANSWER. The marked price of the item was 4800 dollars.
CHECK. The discounted price was 0.9*4800 = 4320 dollars;
the profit is 4320 - 3600 = 720 dollars. ! correct !