Analyze the income statement of JKL Industries for the fiscal year ending December 31, 2023, focusing on its revenue mix and cost behavior.

JKL Industries Income Statement	Year Ended December 31, 2023
Revenue
Domestic Sales	$600,000
International Sales	$400,000
Service Revenue	$100,000
Total Revenue	$1,100,000
Expenses
Cost of Goods Sold	$450,000
Selling and Administrative Expenses	$300,000
Variable Costs	$150,000
Fixed Costs	$200,000
Depreciation Expense	$40,000
Interest Expense	$30,000
Income Tax Expense	$70,000
Total Expenses	$1,240,000
Net Income	-$140,000

Questions:

1. Calculate the revenue mix percentage for domestic, international, and service revenues, and discuss its importance in understanding the company's revenue sources.
2. Analyze the behavior of variable and fixed costs and explain how they impact the company's profitability and cost management strategies.