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By selling two articles for ₹ 800 , a person gains the cost price of three articles. The profit percent is :
Let the cost price of each article be x.
By selling two articles for Rs 800, a person gains the cost price of three articles.
Gain = SP - CP
3x = 2 * 800 - 2x
5x = 1600
x = 320
Thus, the cost price of the article is Rs 320, and the selling price of the article is Rs 800
Profit %age $$=\dfrac{SP-CP}{CP}\times100=\dfrac{800-320}{320}\times100$$
Profit %age $$=150\%$$