The manufacturer, salesman, & merchant's assistant. Part second. On a plan entirely new. Showing, at one view, the neat per centage on any sum, from One Shilling to One Hundred Pounds Sterling, rising from One to Ten Shillings, by One Penny at a Time; from Ten Shillings to Three Pounds, by Three Pence; from Three to Five Pounds, by Five Shillings; from Five to Ten Pounds, by One Pound; and from Ten to One Hundred Pounds, by Ten Pounds; and at any of the following Rates per Cent., viz. From One-Half to Sixty per Cent. inclusive, besides all the Parts of Five; such as, 1?, 2?, 3?, 6?, 7?, 12?, 17?, 22?, &c. To which is added, A diary, Showing the Dominical Letter, and the Day of the Week corresponding to any Day of each Month, from the Year 1779 to 1841 inclusive, A Table, Showing, at One View, the Number of Days from any Day in One Month to the same Day in any other Month [electronic resource].