The leverage ratio using the standardized approach is $20 million.
To calculate the leverage ratio using the standardized approach, you need to add up the total on-balance sheet assets of the bank and divide it by the capital of the bank. On-balance sheet assets are those that are directly recorded on the bank's balance sheet and include cash, treasury securities, residential mortgages, and commercial loans.
In this case, the total on-balance sheet assets of the bank are $100 million + $100 million + $200 million + $600 million = $1,000 million.
The leverage ratio is calculated by dividing the total on-balance sheet assets by the capital of the bank, which is $50 million.
Therefore, the leverage ratio using the standardized approach is $1,000 million / $50 million = 20.
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