Final answer:
The effective tax rate can be calculated by dividing the income tax expense by the pretax net income. In this case, the net income before taxes is $200,000 and the taxable income is $170,000. Therefore, the effective tax rate is 17%.
Step-by-step explanation:
The effective tax rate can be calculated by dividing the income tax expense by the pretax net income. In this case, the net income before taxes is $200,000, which includes $20,000 interest revenue from municipal bonds and $10,000 paid for officers' life insurance premiums. To calculate the income tax expense, we need to subtract these non-taxable items from the net income before taxes. Therefore, the taxable income is $200,000 - $20,000 - $10,000 = $170,000.
Since the tax rate is 20%, the income tax expense is $170,000 x 0.20 = $34,000. To calculate the effective tax rate, we divide the income tax expense by the pretax net income: $34,000 / $200,000 = 0.17, or 17%.