The ready reckoner, or, The trader's useful assistant, in buying and selling all sorts of commodities, either wholesale or retail [microform] : 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 ready 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.