The ready reckoner, 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 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 persons quite unacquainted with arithmetic may hereby ascertain the value of any number of hundreds, pounds, ounces, ells or yards, &c. at any price whatever ... /