Wilson Limited applied the straight-line method of depreciation to its non-current assets. The cost of the buildings was $640 000, the depreciable amount is $560 000, the residual value is $80 000 and the useful life is 8 years. How much is the annual depreciation charge

Wilson Limited applied the straight-line method of depreciation to its non-current assets. The cost of the buildings was $640 000, the depreciable amount is $560 000, the residual value is $80 000 and the useful life is 8 years. The annual depreciation charge is: O a. $80 000. O b. $75000. O c. $70000. O d. $60 000