Given the following information, calculate the return on assets (ROA) for 2020. To calculate the ROA, use the average total assets. Year Sales Gross profit Operating income Taxes Interest Total liabilities Shareholders' equity 2019 $1,000 $400 $300 $50 $45 $1,500 $2,000 2020 $1,200 $550 $470 $75 $80 $1,400 $2,200 2021 $1,100 $450 $420 $60 $50 $1,200 $2,500