Variable costing

Philadelphia Company has the following information for March:

	Sales	$450,000
	Variable cost of goods sold	240,000
	Fixed manufacturing costs	70,000
	Variable selling and administrative expenses	52,000
	Fixed selling and administrating expenses	35,000

FOR CREDIT, SHOW ALL WORK!!!!!!!!!!!!!!!!!!!!

Determine the:

(a) manufacturing margin

(b) contribution margin

(c) income from operations for Philadelphia Company