The book presents a review of basic algorithms used to perform business and fi nancial calculations. The authors describe logics of discounting and accumulating. They explain in a very detailed way schemes and algorithms of evaluating cash fl ows. The evolution of quantity methods of appraising fi nancial operations is also well defi ned. The fourth edition (the fi rst one was published in 1999) included some extensions of a few chapters and it extended the list of bibliography substantially. The publication is meant for students and teaching staff of Economics Universities, as well as for scientifi c and practical persons specializing in fi nance management and bookkeeping.