Calculate the Efficiency ratio for a bank with the following characteristics ($Mils): Interest Revenue $105 Interest Expense $25 Net Interest Margin $80 Non-Interest Income $40 Non-interest Expense $75 Income Before Taxes $45 Provision for Taxes $15 Net Income $30 Total Avg. Assets $300 Total Avg. Liabilities $250 Total Avg. Bank Equity $50 a. The Efficiency ratio is 51.7% b. The Efficiency ratio is 23.8% c. The Efficiency ratio is 62.5% d. The Efficiency ratio is 60%