0. Number System and Rapid Methods of Calculation 1. Approximation 2. Contracted Method of Multiplication 3. Contracted Method of Division 4. Decimalisation 5. Ratio 6. Proportion 7. Table of Nine Value 8. Chain Rule 9. Percentage 10. Discount 11. Commission and Brokerage 12. Simple Interest 13. Compound Interest 14. Compound Interest with the Help of Logarithms 15. Profit and Loss
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