SSC Government Jobs Exams Numerical Ability Profit and Loss

half of the 100 articles are sold at a profit of 20% and the rest at a profit of 40%.had all the articles been sold at a profit of 25%,the total profit would have been Rs 100 less.the cost price of each article is

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Rs. 20

Let CP of each article be Rs. x, then [50x*(120/100) + 50x*(140/100)] - [100x*(125/100)] = 100
=> 60x + 70x - 125x = 100
=> 5x =100
=> x=20
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