[R] sum row and col

[aa99]

 hey ;

i would like to sum the following table by row and col. Appreciate your
help.

BrandName	Segment	Retail	QSlod 
Oral B	        Whitening	10	2 
Colgate	Sensitive	20	4 
Colgate	Sensitive	30	6 
Oral B	        Whitening	40	8 
Close Up	Whitening	50	10 
Oral B	        Whitening	60	12 


Output :

BrandName	Segment	Retail	QSlod  Total
Oral B	        Whitening	10	2        Sum by Col.
Colgate	Sensitive	20	4        Sum by Col.
Colgate	Sensitive	30	6 
Oral B	        Whitening	40	8 
Close Up	Whitening	50	10 
Oral B	        Whitening	60	12 
                              Sum by Row Sum by Row

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