Depreciation method: FACTOR (AX)

Can anyone kindly explain how system calculate the depreciation amount by method “Factor”?

The introduction of AX manual is too general:

“If the entry in the Factor field is larger than 50, the depreciation is
progressive. This means that the amount of depreciation increases
each depreciation period.
• If the entry in the Factor field is less than 50, the depreciation is
digressive. This means the amount of depreciation decreases each
depreciation period.
• If the entry in the Factor field is 50, depreciation is calculated
exactly like straight-line depreciation.”

Is there any useful formular for this method? I appreciate if anyone can give an example with explaination of this method. Thx in advance. Thank you!