Depreciation - different results on HP30b and on paper

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Methods of Depreciation: Formulas, Problems, and Solutions

Straight Line Method

Declining Balance Method
Declining Balance Method is sometimes called the Constant-Percentage Method or the Matheson formula. The assumption in this depreciation method is that the annual cost of depreciation is the fixed percentage (1 - K) of the Book Value (BV) at the beginning of the year.
Annual Rate of Depreciation(K): SV = FC (1 - K)ⁿ

source:Depreciation Methods in Engineering Economics

Any SME's with the formula/equation deployed in the HP-30B ?

BEST!
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