Young, Felina C. Mathematics of investment made simple / - Manila : Rex Book Store, Inc. , c2009. - xi, 353 p. ; 22 cm. Includes bibliographical references & index. ISBN: 9789712352560 Subjects--Topical Terms: 1. Annuities. 2. Business mathematics. Dewey Class. No.: Fil. 513 Y71m 2009