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Text File  |  1990-03-18  |  936 b   |  33 lines
  1. { Macro calculating number of periods to achieve desired balance}
  2. { FORMULA: n=ln(A/P)/ln(1+i)}
  3. {  where P=principal, A=amount, n=number of periods, i=interest }
  4. c                               {clears the calculator tape}
  5. c                               {second "c" clears F4 & F8 memories}
  6. D=9                             {switches to 9 decimal places to}
  7.                                 {minimize rounding errors}
  8. "FIND NUMBER OF"
  9. "PERIODS NEEDED"
  10. "TO  ACCUMULATE"
  11. "DESIRED AMOUNT"
  12. " "
  13. "BEGINNING PRINCIPAL"=
  14. ALT-F8    {stores result in F8 memory for later use}
  15. "AMOUNT DESIRED AFTER AFTER COMPOUNDING"=
  16. ALT-F3    {stores result in F3 memory for later use}
  17. "PERIODIC INTEREST PERCENTAGE"/
  18. 100+
  19. 1=
  20. ALT-F4    
  21. LF4=      {L is LN function, F4 is value stored in F4 memory}
  22. ALT-F4
  23. F3/
  24. F8=
  25. ALT-F8
  26. LF8=      {L is LN function, F8 is value stored in F8 memory}
  27. ALT-F8
  28. F8/
  29. F4=
  30. ALT-F7
  31. D=2
  32. F7=
  33. "NUMBER PERIODS"