please tell me an accurate and easy way to calculate declining balance percentage of depreciation

Sure, here's a simple way to calculate the declining balance percentage of depreciation:

1. Determine the useful life of the asset: This is the number of years you expect the asset to be productive. This information can often be found in the asset's documentation or warranty.

2. Calculate the straight-line depreciation rate: This is done by dividing 1 by the useful life of the asset. For example, if the asset has a useful life of 5 years, the straight-line depreciation rate would be 1 / 5 = 0.20 or 20%.

3. Determine the declining balance rate: This is typically 1.5 to 2 times the straight-line depreciation rate. For example, if the straight-line depreciation rate is 20%, the declining balance rate would be 30% to 40%.

4. Calculate the depreciation for each year: This is done by multiplying the declining balance rate by the book value of the asset at the beginning of the year. The book value is the original cost of the asset minus any depreciation already taken.

5. Subtract the depreciation from the book value to get the new book value for the next year.

6. Repeat steps 4 and 5 for each year of the asset's useful life.

Remember, the declining balance method results in higher depreciation expenses in the early years of an asset's life and lower expenses in the later years.