proc report data=ia.lookup1 nowd;
	column SaleMon RevCargo CTarget Diff;
	define SaleMon/display;
	define RevCargo/analysis sum format=dollar15.2;
	define CTarget/analysis sum format=dollar15.2;
    define Diff/computed format=dollar15.2;
	compute Diff;
		Diff = RevCargo.sum - CTarget.sum;
	endcomp;
run;