Simplified commercial mathematics 
edited by N. K. Nag 
 - Calcutta  Alpha publishing  1967 
 - various pages 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Business Mathematics
<br/><br/><label>Dewey Class. No.: </label>650.01513  / SI612