Socius mercatoris: or The merchant's companion: in three parts. The first, being a plain and easie introduction to arithmetick, vulgur and decimal, the extraction of the square and cube roots, with a table of 200 square roots, and their use in the resolution of square equations. The second, a treatise of simple and compound interest and rebate, with two tables for the calculation of the value of leases or annuities, payable quarterly, the one for simple, the other compound interest, at 6 per cent. per annum, with rules for making the like for any other rate. The third, a new and exact way of measuring solids in the form of a prismoid and cylindroid, with the frustums of pyramids and of a cone: whereunto is added, some practical rules and examples for cask-gauging. By John Mayne, philo-accomptant.

About this Item

Title
Socius mercatoris: or The merchant's companion: in three parts. The first, being a plain and easie introduction to arithmetick, vulgur and decimal, the extraction of the square and cube roots, with a table of 200 square roots, and their use in the resolution of square equations. The second, a treatise of simple and compound interest and rebate, with two tables for the calculation of the value of leases or annuities, payable quarterly, the one for simple, the other compound interest, at 6 per cent. per annum, with rules for making the like for any other rate. The third, a new and exact way of measuring solids in the form of a prismoid and cylindroid, with the frustums of pyramids and of a cone: whereunto is added, some practical rules and examples for cask-gauging. By John Mayne, philo-accomptant.
Author
Mayne, John, fl. 1673-1675.
Publication
London :: printed by W[illiam] G[odbid] for N. Crouch, in Exchange-Alley, over against the Royal-Exchange in Cornhill,
1674.
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Subject terms
Interest -- Tables -- Early works to 1800.
Interest rates -- Early works to 1800.
Link to this Item
http://name.umdl.umich.edu/A50425.0001.001
Cite this Item
"Socius mercatoris: or The merchant's companion: in three parts. The first, being a plain and easie introduction to arithmetick, vulgur and decimal, the extraction of the square and cube roots, with a table of 200 square roots, and their use in the resolution of square equations. The second, a treatise of simple and compound interest and rebate, with two tables for the calculation of the value of leases or annuities, payable quarterly, the one for simple, the other compound interest, at 6 per cent. per annum, with rules for making the like for any other rate. The third, a new and exact way of measuring solids in the form of a prismoid and cylindroid, with the frustums of pyramids and of a cone: whereunto is added, some practical rules and examples for cask-gauging. By John Mayne, philo-accomptant." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A50425.0001.001. University of Michigan Library Digital Collections. Accessed June 8, 2024.

Pages

Prop. III.

A Sum presently due = p, having been forborn time unknown = t, did amount to a cer∣tain Sum = A, at a Rate of Interest = G, per Cent. per Annum. Q. the Time of for∣bearance = t?

Page 104

Equation, 〈 math 〉〈 math 〉

That is to say, the Amount less the Principal, so increased, multiplied by 100, and that Product divided by the Fact of the before-mentioned Principal, and Rate of Interest, quotes the Time of forbearance.

Example.

Quest. 1. If 175 l. hath been forborn till with the Interest at 6 per Cent. per Annum it is increased to be 248 l. 10 s. Q. How long hath it been forborn?

〈 math 〉〈 math 〉

The Answer is 7 years.

Quest. 2. If 25 l. hath been forborn till it is amounted to 27 l. 5 s. at 6 per Cent. per Annum, Simple Interest. Q. In what time is it so increased?

〈 math 〉〈 math 〉

Page 105

〈 math 〉〈 math 〉

The Answer 1 year and an half.

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