Examine the income statement for XYZ Ltd. for the year ended December 31, 2023, to evaluate its revenue streams and cost management.

XYZ Ltd. Income Statement	Year Ended December 31, 2023
Revenue
Product Sales	$600,000
Service Revenue	$80,000
Total Revenue	$680,000
Expenses
Cost of Goods Sold	$250,000
Operating Expenses	$200,000
Depreciation Expense	$30,000
Interest Expense	$10,000
Income Tax Expense	$60,000
Total Expenses	$550,000
Net Income	$130,000

Questions:

1. Compute the contribution margin ratio and discuss its relevance in analyzing each revenue dollar's contribution to covering fixed costs.
2. Analyze the operating profit margin and explain how it reflects the company's operational efficiency.
3. Calculate the net profit margin and discuss its significance in evaluating overall profitability.