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Logarithmologia or the whole doctrine of logarithms, common and logistical, in theory and practice. In three parts / [Benjamin Martin].

  • Benjamin Martin
Date:
1740
Catalogue details

Licence: Public Domain Mark

Credit: Logarithmologia or the whole doctrine of logarithms, common and logistical, in theory and practice. In three parts / [Benjamin Martin]. Source: Wellcome Collection.

    161/342 (page 139)
    Theor. II. — P = the Principal, = the Time. Theor* III, ^ = Rt |_ the Amount of i /. By thefe Theorems the feveraj Queftions of Com* pound Intereft are anfwered iiioft expeditioufly by the Logarithms in the Manner following. 4. Quell. I. What will ^75/, i^s. amount to in 3I Years, dX fer Cent.'per Annwn^ Com¬ pound Intereft ? Here P=275,75 •, R=i,045 > ^^3^5 5 find per Theor. I. . The Logarithm of.R=2:i,o45”0.oi9i 16 multiply by the Time ... t::i= 3,5 The Prod. is the Log. of R^=i,1665=^0.066906 To which add the Log. of P—275,75^2.440515 TheSurhis the Log. of PR^=r:A—321,68—2.507421 , So the Amount fought is 321 /. 13 j. 7 which is .more'”than the Amount by fimple Intereft by 2 /. to j. 'See Queft. I. Art. 3. of the foregoing Chapter. C^eft. II. What Principal or Sum being put to Ufe at 4I/. per Cent. Compound Intereft, will amount to 321 /. 13 s. j d. in 3!- Years ? Here A—321,68 *, R:=i,045 i t—3,5 j to find P, per Theor. II. From the Logarithm of A—32i,68=:2.5C7421 Subducft the Logarithm of R‘=^ 1.1665=0.066906 -i - ■ - A TheDifF. is the Log. S,] therefore the Principal fought is 275/. 15 J- 1' ?. Quea.