Please help!Can anyone gives me a detailed explanation to solve this problem?Thank you!

Question 4 4. A firm bought a non-current asset for $500,000. The asset has an estimated useful economic life of ten years and an estimated scrap value of $50,000. If the asset is depreciated at the rate of 20% per annum, using the reducing balance method, the depreciation charge, in relation to this asset alone, in the second year of its life will be: A. $45,000 B. $80,000 C. $90,000 D. $72,000