GRE Exam Numerical Ability Profit and Loss

robert calculates profit as a percentage of selling price while bob calculates profit as a percentage of cost price there is a difference $250 between their profits on the sale of an article claim to have made a profit of 20% each what is the common selling price of the article?

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GRE Other Question

by selling 15 arcticles a person recieved cost price of 20 articles what is the profit or loss percentage? the list price of a watch costing $450 and $700 if it was sold at sucessive discounts of 10% and d% the net profit is $54 if instead of offering sucessive discounts a single discount of 1.5d% is offered the profit would be?