Answer:
Journal entries 
Explanation:
Before passing the journal entries, first we have to determine the book value of truck which is 
= Cost of delivery truck - accumulated depreciation 
= $56,000 - $41,300
=  $14,700
Now the journal entries are as follows
a. Cash Dr $14,700
Accumulate depreciation $41,300
       To Delivery truck $56,000
(Being the disposal of the truck is recorded)
b)  Cash Dr $16,400
Accumulate depreciation $41,300
       To Delivery truck $56,000
        To Gain on sale $1,700
(Being the disposal of the truck is recorded)
c) Cash Dr $12,900
Accumulate depreciation $41,300
Loss on sale $1,800
       To Delivery truck $56,000
(Being the disposal of the truck is recorded)