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2500 is greater than 500 by _________%.

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Abida bought 100 pens at the rate of Rs 3.50 per pen and pays a sales tax of 4%. The total amount paid by Abida is _________.

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The cost of a tape-recorder is Rs 10,800 inclusive of sales tax charged at 8%. The price of the tape-recorder before sales tax was charged is________.

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Four times a number is a _________ % increase in the number.

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5% sales tax is charged on an article marked Rs 200 after allowing a discount of 5%, then the amount payable is _________.