SSC Government Jobs Exams Numerical Ability Profit and Loss

If the cost price of 10 articles is equal to the selling price of 8 articles, then gain per cent is

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SSC Other Question

The average of 25 observations is 13. It was later found that an observation 73 was wrongly entered as 48. The new average is An article is marked 40% above the cost price and discount of 30% is allowed. What is the gain or loss percentage?