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Functions & basics easy

Compound interest calculator in Python

Compute future investment value with the compound interest formula and a readable year-by-year loop.

math finance functions

Python

def future_value(
    principal: float,
    annual_rate: float,
    years: int,
    compounds_per_year: int = 12,
) -> float:
    """Return balance after compound interest (rounded to cents)."""
    rate_per_period = annual_rate / compounds_per_year
    periods = compounds_per_year * years
    amount = principal * (1 …

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