A) Following information is from the past financial statements of BHP Group Limited (BHP).

Income Statement ($million)
Item	2019	2020	2021
Sales	63711.68	63686.43	81573.56
Operating Expenses	-30690.15	-31650.88	-32092.31
EBITDA	33021.53	32035.55	49481.25
Depreciation and Amortisation	-8311.71	-8905.73	-9076.88
EBIT	24709.82	23129.83	40404.36
Net Interest Expense	-1517.18	-1327.41	-1735.83
Profit Before Tax	23192.64	21802.42	38668.53
Tax Expense	-8229.00	-7307.30	-13065.97
Net Profit	14963.64	14495.12	25602.55
Balance Sheet ($million)
Item	2019	2020	2021
Total Current Assets	33328.10	35505.45	41608.36
Total Non-Current Assets	110491.94	109382.81	96533.60
Total Assets	143820.05	144888.27	138141.97
Total Current Liabilities	17594.47	21818.30	24559.44
Total Non-Current Liabilities	52328.53	49107.48	42794.31
Total Liabilities	69923.00	70925.78	67353.75
Total Equity	73897.05	73962.49	70788.21
Total Liabilities & Equities	143820.05	144888.27	138141.97

i) Based on the information provided in the table above calculate Return on Equity (ROE) of BHP for 2020 and 2021.

ii) Use Dupont analysis to decompose BHPs ROE for 2020 and 2021.

iii) Based on the various components of ROE calculated in the Dupont analysis above, discuss why BHPs ROE has changed from 2020 to 2021.