Lindquist Company has the following information for February:

Line Item Description	Amount
Sales	$7,150,000
Variable cost of goods sold	2,430,000
Fixed manufacturing costs	1,250,000
Variable selling and administrative expenses	900,000
Fixed selling and administrative expenses	110,000

Determine the following for Lindquist Company for the month of February:

Line Item Description	Amount
a. Manufacturing margin	$fill in the blank 1
b. Contribution margin	$fill in the blank 2
c. Operating income	$fill in the blank 3