人口增长问题python

我国2018年有人口14亿，按人口年增长率r（单位为%）计算，到哪一年我国人口将超过16亿？人口年增长率由输入获得。
输入格式:
输入一个实数，代表增长率，单位为百分比%。
注意计算时需进行转换，输入时不要任何提示信息。

start = 2018
t = 14
r = float(input())/100
i = 0
while 1:
    i += 1
    t *= 1+r
    if t > 16:
        break
print(start + i)

increase_rate = float(input())
population_num = 14
year_num = 2018
while population_num < 16:
    population_num *= (1 + increase_rate / 100)
    year_num += 1
print(year_num)

people = 14
i = 0
r = float(input())
while people <= 16:
    i += 1
    people *= (1+r/100)
year = 2018 + i
print(year)