[R] Aggregating two or more vaiables

[aa99]

hey;

i am new to R and require some help. i have below table data and i would
like to aggregate Retail and QSold by BrandName.


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 I would like:

BrandName	Retail 	QSlod
Oral B	        sum(Retail)	Sum (Qsold)
Colgate		
Close Up		





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