Compute Straight-line depreciationand revised depreciation

Equipment was acquired on January 1, 2015 for $65,000. The equipment was depreciated using the straight-line method and had a salvage value of $3,000 and a useful life of 10 years. At the at end of 2020 (before recording the adjustment for 2020), management revised the total useful life to 15 years and a salvage value of $4,000. What is the revised annual depreciation?

HI can i have the sloution for both stright line depreciation and revised annual depreciation with explanation about how i count the usefull time? thank you