c_ij						
	11	11	7	12		
	6	9	6	10		
	5	8	11	10		
x_ij					row totals	request
	0	0	50	0	50	50
	0	60	20	120	200	200
	120	30	0	0	150	150
column totals	120	90	70	120		total costs
capacity	120	90	70	120		3050