Analyze the income statement for ABC Corp. for the year ended December 31, 2023, to understand its revenue generation and expense management.

ABC Corp. Income Statement	Year Ended December 31, 2023
Revenue
Sales Revenue	$500,000
Interest Income	$10,000
Total Revenue	$510,000
Expenses
Cost of Goods Sold	$200,000
Selling and Administrative Expenses	$150,000
Depreciation Expense	$20,000
Interest Expense	$5,000
Income Tax Expense	$50,000
Total Expenses	$425,000
Net Income	$85,000

Questions:

1. Calculate the gross profit margin and explain its significance in assessing the company's profitability.
2. Analyze the operating margin and discuss its usefulness in evaluating operational efficiency.
3. Compute the net profit margin and explain how it reflects the company's overall profitability.