The ready reckoner [electronic resource] : or trader's most useful assistant, in buying and selling all sorts of commodities either Wholesale or Retail. Shewing at one View The Amount or Value of any Number or Quantity of Goods or Merchandise from one Farthing progressively up to Twenty Shillings, either by the long or short Hundred, Half Hundred or Quarter, Pound or Ounce, Ell or Yard, &c. &c. In so plain and easy a Manner, that even a Child may hereby ascertain the Amount of any Number of Hundreds, Pounds, Ounces, Ells or Yards, &c. at any Price whatever from one Farthing to Twenty Shillings. And to the most ready in Figures, it will be equally useful by saving a great Deal of Time in casting-up, what is here correctly done to their Hand. To which is added, a double table of Portugal money from 1 to 1000. Also A Table of Expences or Wages by the Day, Week, Month or Year. With a table of annuities and Commission or Brokerage from one to one Eighth per Cent. And several other necessary and instructive Things. By Daniel Fenning, (author of a New Treatise of Arithmetic, Use of the Globes and the Universal Spelling-Book) and Others.