I do not know how to calculate a two a 410000 depreciated straight line with a four year life and a salvage value of zero

This would be an easy journal entry:-

Depreciation Account 102,500
Provision for Depreciation of Asset 102,500

Being Depreciation calculation for the first year on the equipment.

Note: - you would need to repeat this entry for the next three years.

in SLM you could calculate depreciation by using this formula:
Dep = (Assets Value - Salvage Value)/life time
Dep = (410000 - 0)/4 = 102500 annually

We certainly agree, which is a good thing.

Roland.

Provision for Depreciation of Asset 102,500



Known in the U.S. as Accumulated Depreciation.

I'm certainly glad we have you two to do people's homework for them.