This book develops topics of simple and compound interest; the topics of rational discount, bank discount and commercial discount; those of interest rates, conversions of interest rates and inflation rate; those of expired, anticipated, deferred and general annuities; those with arithmetic and geometric gradients; those of perpetuities, and the subjects of amortizations of loans and amortization funds. These topics are integrated into 32 chapters, each of which presents a theoretical framework, examples and practical problems solved, a list of formulas, proposed problems and a general summary. Each one of the chapters also contains explained and proposed application cases that will allow the reader to structure short-, medium- and long-term financial projects and products.