money = float(input("please input you want to double the money:"))
double_money = money * 2
year = 0
interest = float(input("please input interest:"))
interest_money = 0
while money <= double_money:
interest_money = money * interest
money += interest_money
year += 1
print(f"generate interest {interest_money} in year {year}")
print(f"your money need {year} year to double it...")
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