## Clavis Usuræ: Or, A Key to Interest |

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### Common terms and phrases

Add The Sum aforeſaid againſt allow'd alſo Annum becauſe becomes due call’d Caſe Compound Intereſt Computed Conſequently Conſideration Decimal Diff Divide Dividend Diviſion Diviſor eaſily Equated Firſt forborn or unpaid found by Logarithms given Number given Rate Half-yearly Payments Half-yearly Rents Index Inſtance inſtead Intereſt per Cent itsLog juſt laſt Example Leaſe Leſs Loga Logar Mathematician's Guide moſt Multiply The Produćt muſt natural Numbers Nine Tears Number called Number of Days paid perform'd by Logarithms Perſons preſent Worth Principal Produá propoſed Amount propoſed Sum Purchaſer Quarterly Payments Queſtion Quotient will ſhew Raiſe Rate of Intereſt Ratio ready Money Remains the Log Remains the Logarithm requir’d required to find Reſerved Quotient Reſolved reſpective Reverſion rithm Rule ſaid ſame ſay ſeveral ſhall ſhould Simple Intereſt ſmall ſome ſought Subſt Subſtraćt Suppoſe Table Thence to find theſe thoſe uſe whole Numbers whoſe Yearly Payments Yearly Rent

### Popular passages

Page 113 - And to account it as a Blessing that we have survived, perhaps by many Years, that Period of Life, whereat the one half of the whole Race of Mankind does not arrive.

Page 112 - Rule to eftimate the Value of the Remainder of one Life after another. Now as the Product of the Two Numbers in the Table for the Two Ages propofed, is...

Page 109 - Table is to shew the differing degrees of Mortality, or rather Vitality in all Ages; for if the number of Persons of any Age remaining after one year, be divided by the difference between that and the number of the Age proposed, it shews the odds that there is, that a Person of that Age does not die in a Year.

Page 109 - Persons of the Age proposed, and divide it by the difference between it and the number of those of the...

Page 27 - Year chance to be juft ~ .1 or ^ of a Year, then the beft way will be to Reduce the Odd Time into Days, and. then work with the Decimal Parts of a Year that are equivalent to thofe Number of Days.

Page 112 - So if. the prefent Value of a Sum of Money, to be paid certainly after fo many Tears, to the prefent Value of the fame Sum to be paid, provided one of thofe Three Perfons be living at the Expiration of that Term. Which Proportion being yearly repeated, the Sum of all thofe prefent Values will be the Value of an Annuity granted for three fuch Lives.

Page 105 - Tis true indeed, that there can be no certain Rules prefcrib'd for their true Valuation, becaufe the Lives of all Mankind are uncertain ; and 'tis poffible, and daily feen, that .a Young Man may Die before one of a greater Age : But yet there is a greater Probability of a Young Man's Living longer than an Old one ; And not only...

Page 106 - Tis three times more likely, that one of 9 years old should attain the age of 70, than the said Infant. Moreover, 'tis twice as likely, that one of 16 should reach that Age, as that one of 4 years old should do it ; and one third more likely, than for one of nine.

Page 110 - ... the Table at what Year the said number is reduced to half by Mortality; and that is the Age, to which it is an even Wager, that a Person of the Age proposed shall arrive before he die. As for Instance; a Person of 30 Years of Age is proposed, the number of that Age is 531, the half thereof is 265, which number I find to be between 57 and 58 Years; so that a Man of 30 may reasonably expect to live between 27 and 28 Years.

Page 109 - Table is 377, and subtract it from the number of Persons of 40 years, which is 445, and the difference is 68 : Which shews that the Persons...