Answer:
Total Depreciation = 31909
Step-by-step explanation:
given data 
purchased machine = $200,000
service life = 10 years 
residual value = $20,000
 
to find out 
Depreciation
solution
we get here first Sum of Digits for life 10 year that is 
sum = (10+9+8+7+6+5+4+3+2+1) 
sum = 55 
now we take here from Jan 1, 2014 to Sep30, 2014 
here Number of Months = 9 months 
so Depreciation will be 
Depreciation = (200000-20000) × 
 ×
 ×
 
 
Depreciation = $24545 .......................1
and 
now we take from Oct 1, 2014 to Dec 31, 2014 
here Number of Months = 3 months 
so depreciation will be 
 Depreciation = (200000-20000) × 
 ×
 ×
 
 
(9/55)*(3/12) 
 Depreciation = $7364 ..........................2
so total Depreciation will be by add equation 1 and 2 
Total Depreciation = $24545 + $7364 
Total Depreciation = 31909
so correct option is $31,909