Answer:
Check the following explanation.
Step-by-step explanation:
This will be covered under Accounting principles , Changes and Restatements.
Specifically FAS 154 requires such change to be recognized currently and prospectively.
In this case the effect of change will be carried in current year and future years also as there is change in estimate life of equipment and its salvage value. Company can not mae any change in any past year as there is restriction on making such change. So it will show its prospective effect only.