The ready reckoner [electronic resource], or, trader's sure guide: adapted for the use of all persons who buy or sell any sort of commodities, wholesale or retail. Shewing, at one view, by exact tables, the amount or value of any number or quantity of goods or merchandise, from One Farthing to Twenty Shillings; either by the Ounce, Pound, Yard, or Ell, Hundred, Half Hundred, or Quarter. With tables of interest, at 4, 4 1-half, and 5 per cent. from One Day to a Year, &c. &c.