By request from MHF users and other folks, I've revamped this and have a version 2.0 which is much more user friendly and details more math.
Included now is our teachers corner quiz generator as well.
The calculator solves for Depreciation at time t, Asset Value, and Salvage Value using the sinking fund method.
It will always calculate Book Value at time t as well.
Sinking fund depreciation method calculator