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The cost price of 10 tables is equal to the sale price of 5 tables. The profit per cent in this transaction is______.

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By selling an article for Rs 1,12,000 a girl gains 40%. The cost price of the article was _________.

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The loss per cent on selling 140 geometry boxes at the loss of S.P. of 10 geometry boxes is equal to _________.

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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________.