capital calculation, compound interest

interest.py

initial_capital=100
raised_capital=120
diff = raised_capital - initial_capital
percent = diff / 100
profit_percent=0.1

def compond_interest(present_value, profit_percent, number):
    """
    """
    final_value=present_value*pow(1+profit_percent, number)
    return final_value

def simple_interest(present_value, profit_percent):
    """
    """

    final_value = present_value + (present_value * profit_percent)
    return final_value

val_simple = simple_interest(present_value=initial_capital, profit_percent=profit_percent)
val_compond = compond_interest(initial_capital, .1, 12)

print(round(val_simple, 2))
print(round(val_compond, 2))