The 2015 income statement for TeleTech is shown here:

Net Sales	$35,000,000.00
Cost of Goods Sold	15,000,000.00
Gross Profit	20,000,000.00
Selling and Admin. Expenses	1,000,000.00
Depreciating Expense	3,000,000.00
Operating Income (EBIT)	16,000,000.00
Interest Expense	2,500,000.00
Income Before Taxes (EBT)	13,500,000.00
Taxes (40%)	5,400,000.00
Net Income	8,100,000.00

Calculate the following (Show your Work):

a. Gross Profit Margin

b. Operating Profit Margin

c. Net Profit Margin