Hardin Company has the following information for July:
Sales...................................................................................$625,000
Variable cost of goods sold...............................................325,000
Fixed manufacturing costs..................................................56,250
Variable selling and administrative expenses................162,500
Fixed selling and administrative expenses.......................37,500
Determine 

(a) The manufacturing margin, 

(b) The contribution margin, and 

(c) Income from operations for Hardin Company for the month of July.