Question 195049
The percent profit made when an article is sold for Rs.78 is twice as when it is sold for Rs. 69.The cost price of the article is ? 
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Profit = Revenue - Cost 
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Equations:
2p = 78 - C 
p  = 69 - C 
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p = 9
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Substitute into p = 69 - C  to get:
9 = 69 - C
Cost = 60Rs
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Cheers,
Stan H.