| | Summary | 5 |
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| Introduction | 9 |
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| 1 To Know WHAT and HOW | 17 |
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| 2 The Root of the Solution | 21 |
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| 3 Problem Definitions | 29 |
| 1 Problem given by Tijhaar - systems Van der Schroeff and Bakker | 32 |
| 2 With lines from a problem-collection presented by Slot/Vijn | 33 |
| 3-4 Two problems given by Bremmers in TBA, nr. 1070 | 35 |
| 5 Central problem, textbook Epe/Koetzier | 37 |
| 6 Problem given by Vijge_individual f standards | 39 |
| 7 Trading company PRINSVLIET NV (SPD-Examination Dec. 1992) | 41 |
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| 4 ELABORATIONS | 43 |
| 1 Problem given by Tijhaar - systems Van der Schroeff and Bakker | 48 |
| 2 With lines from a problem-collection presented by Slot/Vijn | 51 |
| 3-4 Two problems given by Bremmers in TBA, nr. 1070 | 56 |
| 5 Central problem, textbook Epe/Koetzier | 62 |
| 6 Problem given by Vijge_individual f standards | 87 |
| 7 Trading company PRINSVLIET NV (SPD-Examination Dec. 1992) | 94 |
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| 5 Conclusion | 101 |
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| APPENDICES | |
| 1 The present way of calculating profit | 105 |
| 2 Measuring profit is not an economic problem | 107 |
| 3 Interest charges and foreign currencies | 109 |
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| References | 111 |
