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_________ expenses are the additional expenses incurred by a buyer for an item over and above its cost of purchase.

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Sales tax = tax % of _________.

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The time period after which the interest is added each time to form a new principal is called the _________.

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The discount on an item for sale is calculated on the _________.

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When principal P is compounded semi-annually at r% per annum for t years, then Amount = _________.