Calculate the following financial ratios for Apple Inc. using the provided data:

Item	Amount ($)
Current Assets	$100,000,000
Current Liabilities	$50,000,000
Total Assets	$300,000,000
Total Liabilities	$150,000,000
Net Income	$20,000,000
Sales	$200,000,000
Total Equity	$150,000,000

Calculate the current ratio, debt-to-equity ratio, and net profit margin.