if a business has $x revenue and $y% fixed growth rate every year, how much revenue will it have in the next $z years?

calc_growth.py

from pprint import pprint

def calc_growth(revenue, fixed_rate, years):
    """Calculate growth rate

    revenue: Initial revenue.
    fixed_rate: fixed rate to grow in a year. It's between 0 and 1.
    years: number of years.
    """
    init_revenue = revenue
    output = []
    for year in range(1, years + 1):
        revenue = revenue + (revenue * fixed_rate)
        cum_growth_rate = (revenue - init_revenue) / 100 / 10
        year_status = {
            "year": year,
            "revenue": round(revenue, 3),
            "cum_growth_rate": round(cum_growth_rate, 3),
        }
        output.append(year_status)
    return output


# if a business has 1000 revenue and 13% fixed growth rate every year, how
# much revenue will it have in the next 5 years?
out = calc_growth(1000, 0.13, 5)
pprint(out)
# [{'cum_growth_rate': 0.13, 'revenue': 1130.0, 'year': 1},
#  {'cum_growth_rate': 0.277, 'revenue': 1276.9, 'year': 2},
#  {'cum_growth_rate': 0.443, 'revenue': 1442.897, 'year': 3},
#  {'cum_growth_rate': 0.63, 'revenue': 1630.474, 'year': 4},
#  {'cum_growth_rate': 0.842, 'revenue': 1842.435, 'year': 5}]