related expenses incurred by our logistics subsidiaries for external transportation and increased crew transportation and lodging due to volumes and a slower network .
in addition , higher consulting fees and higher contract expenses ( including equipment maintenance ) increased costs compared to 2013 .
locomotive and freight car material expenses increased in 2014 compared to 2013 due to additional volumes , including the impact of activating stored equipment to address operational issues caused by demand and a slower network .
expenses for purchased services increased 10% ( 10 % ) in 2013 compared to 2012 due to logistics management fees , an increase in locomotive overhauls and repairs on jointly owned property .
depreciation 2013 the majority of depreciation relates to road property , including rail , ties , ballast , and other track material .
depreciation was up 7% ( 7 % ) compared to 2013 .
a higher depreciable asset base , reflecting higher ongoing capital spending drove the increase .
depreciation was up 1% ( 1 % ) in 2013 compared to 2012 .
recent depreciation studies allowed us to use longer estimated service lives for certain equipment , which partially offset the impact of a higher depreciable asset base resulting from larger capital spending in recent years .
equipment and other rents 2013 equipment and other rents expense primarily includes rental expense that the railroad pays for freight cars owned by other railroads or private companies ; freight car , intermodal , and locomotive leases ; and office and other rent expenses .
higher intermodal volumes and longer cycle times increased short-term freight car rental expense in 2014 compared to 2013 .
lower equipment leases essentially offset the higher freight car rental expense , as we exercised purchase options on some of our leased equipment .
additional container costs resulting from the logistics management arrangement , and increased automotive shipments , partially offset by lower cycle times drove a $ 51 million increase in our short-term freight car rental expense in 2013 versus 2012 .
conversely , lower locomotive and freight car lease expenses partially offset the higher freight car rental expense .
other 2013 other expenses include state and local taxes , freight , equipment and property damage , utilities , insurance , personal injury , environmental , employee travel , telephone and cellular , computer software , bad debt , and other general expenses .
higher property taxes , personal injury expense and utilities costs partially offset by lower environmental expense and costs associated with damaged freight drove the increase in other costs in 2014 compared to 2013 .
higher property taxes and costs associated with damaged freight and property increased other costs in 2013 compared to 2012 .
continued improvement in our safety performance and lower estimated liability for personal injury , which reduced our personal injury expense year-over-year , partially offset increases in other costs .
non-operating items millions 2014 2013 2012 % (  % ) change 2014 v 2013 % (  % ) change 2013 v 2012 .

<i>Millions</i>
<i>2014</i>
<i>2013</i>
<i>2012</i>
<i>% Change</i> <i>2014 v 2013</i>
<i>% Change</i><i>2013 v 2012</i>
Other income
$151
$128
$108
18%
19%
Interest expense
(561)
(526)
(535)
7
(2)
Income taxes
(3,163)
(2,660)
(2,375)
19%
12%

other income 2013 other income increased in 2014 versus 2013 due to higher gains from real estate sales and a sale of a permanent easement .
these gains were partially offset by higher environmental costs on non-operating property in 2014 and lower lease income due to the $ 17 million settlement of a land lease contract in 2013 .
other income increased in 2013 versus 2012 due to higher gains from real estate sales and increased lease income , including the favorable impact from the $ 17 million settlement of a land lease contract .
these increases were partially offset by interest received from a tax refund in 2012. .

Question: Analyse this data from a financial earnings document. assuming an average interest rate of 7% ( 7 % ) , what is the implied composite debt level for 2014 , in millions?
Choices:
8014.28571
-8014.28571
0.00012
2157.14286
801428.57143
Correct choice index: 0