@@ -90,7 +90,9 @@ def straight_line_depreciation(
9090
9191 return list_of_depreciation_expenses
9292
93- def declining_balance_depreciation (useful_years : int ,
93+
94+ def declining_balance_depreciation (
95+ useful_years : int ,
9496 purchase_value : float ,
9597 residual_value : float = 0.0 ,) -> list [float ]:
9698 """
@@ -141,10 +143,12 @@ def declining_balance_depreciation(useful_years: int,
141143 new_book_value = book_value * (1 - depreciation_rate )
142144 list_of_depreciation_expenses .append (round (book_value - new_book_value , 2 ))
143145 book_value = new_book_value
144-
146+
145147 return list_of_depreciation_expenses
146148
147- def sum_of_years_digits_depreciation (useful_years : int ,
149+
150+ def sum_of_years_digits_depreciation (
151+ useful_years : int ,
148152 purchase_value : float ,
149153 residual_value : float = 0.0 ,) -> list [float ]:
150154 """
@@ -190,20 +194,15 @@ def sum_of_years_digits_depreciation(useful_years: int,
190194
191195 list_of_depreciation_expenses = []
192196
193- for i in range (1 , useful_years + 1 ):
194- depreciation_value = (useful_years - (i - 1 )) / digits_sum * (purchase_value - residual_value )
197+ for i in range (1 , useful_years + 1 ):
198+ depreciation_value = (
199+ (useful_years - (i - 1 )) / digits_sum * (purchase_value - residual_value )
200+ )
195201 list_of_depreciation_expenses .append (round (depreciation_value , 2 ))
196202
197-
198203 return list_of_depreciation_expenses
199204
200205
201-
202-
203-
204-
205-
206-
207206if __name__ == "__main__" :
208207 import doctest
209208
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