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(26) The interest must follow the ratio of the sum lent & also of the time. Therefore the interest is in a ratio compounded of these; that is a number is to be found which is to 5 in a compound ratio of 7 months to 12 months & of 665£ to 100£. x = The interest sought. Then formula formula

86. V. Three Merchants gain'd in fellowship 1560£. The first laid out 2000£, & at years end drew it out again; the Second put it 660£, for 7 months; & the third 1255£, for 5 months: How is the gain to be divided?

The gain is to be divided in the ratios of the money each brought & the time they continued it in the joint stocks. therefore the problem is reduced to this, to divide 1560 into 3 parts, which shall be