If a shopkeeper makes a sale without any sales tax, then the selling price of 600 articles is equal to the cost price of 750 articles. On the other hand, if he makes a sale including the sales tax, then the selling price of 450 articles is equal to the cost price of 630 articles. What is the rate of sales tax?

If a shopkeeper makes a sale without any sales tax, then the selling price of 600 articles is equal to the cost price of 750 articles. On the other hand, if he makes a sale including the sales tax, then the selling price of 450 articles is equal to the cost price of 630 articles. What is the rate of sales tax? Correct Answer 12%

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