The textbook is intended for students of the direction 380301 "Economics", studying in the discipline "Financial Mathematics" . The manual meets the requirements of the GEF 3+ and is written in accordance with the work program of the discipline "Financial Mathematics" . The manual includes the following topics: "Formula of growth" , "Comparing growth by compound and simple percentages" , "Nominal rate" , "Effective rate" , "Discounting at a Difficult Rate" , "Effective discount rate" , "Accruals at the discount rate" , "Determination of loan term and interest rate" , "Continuous Interest" , "Relationship of Discrete and Continuous Interest Rates" . The proposed manual contains tasks for independent solution and can be useful in the process of classroom and independent work of students .