What is the correct depreciation rate to be used to set up the following depreciation method?

Summary:

Kindly help what is the correct rate to be used

STL 60B - Straight-Line with 60% Bonus Depreciation

STL 80B - Straight-Line with 80% Bonus Depreciation

Life in years 3

Prorate period in years 12

We need to have the correct depreciation rate

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