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Text File  |  1990-03-17  |  682b  |  28 lines
  1. { Macro calculating interest rate from present value, etc.}
  2. { FORMULA: i=((A/P)^(1/n))-1}
  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  INTEREST"
  9. "RATE NEEDED TO"
  10. "ACCUMULATE THE"
  11. "DESIRED AMOUNT"
  12. " "
  13. "BEGINNING PRINCIPAL"=
  14. ALT-F8
  15. "AMOUNT DESIRED AFTER AFTER COMPOUNDING"=
  16. ALT-F3
  17. 1/
  18. "NUMBER OF PERIODS COMPOUNDED"=
  19. ALT-F4
  20. F3/
  21. F8^
  22. F4-
  23. 1*
  24. 100=
  25. ALT-F4
  26. D=2
  27. F4=
  28. "INTEREST RATE"