Tiffany Company has the following information for March:
Sales........................................................................................$360,000
Variable cost of goods sold....................................................129,600
Fixed manufacturing costs.......................................................86,400
Variable selling and administrative expenses........................28,800
Fixed selling and administrative expenses.............................21,600
Determine 

(a) The manufacturing margin, 

(b) The contribution margin, and 

(c) Income from operations for Tiffany Company for the month of March.