The accomptant's companion [electronic resource] : or young arithmetician's guide. Being an easy introduction to arithmetic, in Whole Numbers, and Fractions, Vulgar and Decimal, each Rule exemplified by a Number of Examples to make the whole Plain and Familiar; Interest, Simple and Compound, Annuities, Rebate, and Equation of Payments: Exchange, Extraction of the Square and Cube Roots and their Application to Use. A Collection of Questions with their Answers, serving to illustrate all the Rules; with variety of Receipts, Promissory Notes, Bills of Parcels, &c. to qualify Youth for Trade and Business. To which is added, an appendix of cross multiplication, applied to mensuration, as used by different Artificers; with a few Questions for the Amusement of those who have made a Progress in Numbers; and a Perpetual Almanack. The Whole Designed for the Use of Schools, and is recommended by several eminent Mathematicians and Schoolmasters. The second edition, corrected, augmented and improved. By Thomas Harper, Master of the Academy in Harley-Street, Cavendish-Square.