def dog_years(human_years):
    return human_years * 7

def dog_name():
    return "Fido"

def interest_calculator(money, rate_percent):
    rate = rate_percent * .01
    return money * rate

def dog_stats(years):
    name = dog_name()
    age = dog_years(years)
    return name + " is " + str(age) + " years old"