15%

The depletion allowance for royalty income is typically 15% of the gross income from the property. This allowance is designed to account for the reduction in the value of the mineral or natural resource being depleted.

pattern allowance is needed as it gives shrinkage allowance, machining allowance,draft allowance,shaking allowance and distortion allowance.

depletion of environment

ozone depletion is the depletion of ozone molecules. It is due to CFC's reacting iwth it.