def calculate_income(percent):
    def annual_income(amount):
        return amount * percent / 100
    return annual_income # function returned by outer function

interest_rate_3 = calculate_income(3) # function assigned to the variable
interest_rate_7 = calculate_income(7)
interest_rate_10 = calculate_income(10)

print(interest_rate_3(1500))     # 45.0
print(interest_rate_3(2000))     # 60.0
print(interest_rate_10(1500))    # 150.0

print(interest_rate_7(1500))     # 105.0
print(interest_rate_7(2000))     # 140.0
print(interest_rate_10(2000))    # 200.0