The ready reckoner : or, The trader's 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 half a farthing to 20s. 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 a person, quite unacquainted with arithmetick, may hereby ascertain the value of any number of hundreds, pounds, ounces, ells or yards, &c. at any price whatever.--To the most read in figures it will be equally useful, by casting up what is here correctly done to their hand. To which is added, a table of simple and compound interest. By Daniel Fenning.