full compound interest model
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Your Excel model is ready with 3 sheets:
- Model — the full model with a summary block and 20-year year-by-year table. Blue cells (principal, rate, monthly add, years, compounding frequency) are your editable inputs. Columns C and D in the table can be overridden per year to model rate changes or variable contributions.
- Chart — a line chart showing end balance vs. total invested over time.
- Instructions — a guide explaining the color coding and how to override individual years.