Prior to adjustment at the end of the year, the balance in Trucks is $414,400 and the balance in Accumulated Depreciation—Trucks is $122,080

Prior to adjustment at the end of the year, the balance in Trucks is $414,400 and the balance in Accumulated Depreciation—Trucks is $122,080. Details of the subsidiary ledger are as follows: 
 Truck No.  
1
2
3
4

Cost  
81500
115400
92500
125000

Estimated Residual Value
12225
13848
12950
15000

 Estimated Useful Life
230000 miles
360000
201000
270000
 Accumulated Depreciation at Beginning of Year
-
23080
74000
25000

 Miles Operated   During Year
34500 miles
36000
20100
32400

a) Determine for each truck the depreciation rate per mile and the amount to be credited to the accumulated depreciation section of each subsidiary account for the miles operated during the current year. Keep in mind that the depreciation taken cannot reduce the book value of the truck below its residual value. 

b) Journalize the entry to record depreciation for the year.