Tables of profit, discount, commission and brokerage

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Page vii - Sir," said I, after puzzling a long time over "more requiring more and less requiring less" — "will you tell me why I sometimes multiply the second and third terms together and divide by the first — and at other times multiply the first and second and divide by the third?" "Why, because more requires more sometimes, and sometimes it requires less — to be sure. Haven't you read the rule, my boy?" " Yes, sir, I can repeat the rule, but I don't understand it.
Page xvi - RULE. As the price whose rate per cent. is given : Is to 100, with the given rate added or subtracted : • So is the other given price : To a fourth number ; From which number subtract 100 in case of gain ; but which Subtract from 100 in case of loss.
Page x - To know what would be gained or lost per cent, if goods, sold at such a rate, there is gained or lost so much per cent, if sold at another rate.
Page xxiv - RULE. — Multiply the given sum by the rate per cent., and divide the product by 100, as in Commission.
Page viii - To find the COST when the selling price and the gain or loss per cent, are given. Ex. 1. If I sell...
Page vii - ... the same proportion to the third, as the second does to the first. The thing we have first to do is, to discover the ratio between the first and second terms, in order to...
Page viii - Insurance may be repaid: (1.) subtract the rate from £100; (2.) as the remainder is to £ 100, so is the value of the property to the sum to be insured.
Page xix - Irill for the time it has to run: thus, for the present payment of a bill of £105, due a year hence, they would deduct the interest of £105, that is...
Page viii - As 100 with the rate per cent. added if gain, or subtracted if loss, is to 100, so is the selling price to the prime cost.
Page vii - As the buying price is to the gain or loss on it; so is 100 to the gain or loss, per cent. EXAMPLE I.

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