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The problems (the definitions are to be found in Money Calculus) are worked out completely in this book: Money Calculus - ELABORATIONS.<br/>Money Calculus ISBN 9798786252805 presents Theory & Exemplary Problems.<br/>As an old teacher business economics (I am now retired) I really give the advice my book Money Calculus in which I fully explained two formulas: the well-known compounding c.q. discounting formula (in discrete or continuous form) and the formula of equal annuities including residual value. And I have given the working-outs of various exercises. All money calculus can be solved by means of these two formulas and any simple pocket calculator will suffice to assist, apart from some basic reckoning skilfulness.<br/>The problems in Chapters 7 and 8 of the textbook of Bruijns/Pinkse A series miscellaneous problems The CASES in a textbook of Van den Bergh/Wesseling.<br/>I have explained first how to do money calculus. Lecture is that, as it were, and then the above 3 series of issues try to solve it self, after which as in a seminar also everything becomes clear to you with this book Money Calculus - ELABORATIONS.<br/>Directly, with no more than the above mentioned two simple formulas, all these problems have been solved. The working-outs by both Bruijns/Pinkse and Van den Bergh/Wesseling show some errors and many rounding-off mistakes. Each step in calculations is a potential cause of faults. The fewer the steps the better. The same applies for formulas and all kinds of aids and appliances; the fewer the better. Errors and rounding-off mistakes are dangerous because they may usher in wrong conclusions.<br/>At many schools and universities worldwide, the teaching of money calculus can, and should be improved. The mean of amounts of money at different dates or whatever "calculation" which does not give justice to the 'present value' of money, is artificial. Balance sheets stating long term liabilities at face value are fiscally and otherwise acknowledged as 'de