[R] How to read percentage and currency data?

[Hrishi Mittal]

I'm struggling to find any help on this seemingly simple question - how does
one read data with percentage (%) or currency (£,$ etc.) signs? When I try
to read a data file which has any of those symbols in the data fields, they
are read as characters rather than values. Is there a function or library
which can deal with such values?

As an example, I use this sample from one of chinna's questions:

Store	Year	Revenue      
abc	2010	$557889    
def	2010	$697356

Similarly, for percentage values:

Product	Sale1	Sale2	Sale3	Sale4	Sale5	Sale6	Sale7
A	101.00%	93.00%	85.00%	65.00%	74.00%	102.00%	119.00%
B	585.00%	484.00%	599.00%	653.00%	726.00%	882.00%	1035.00%
C	18.00%	19.00%	25.00%	15.00%	31.00%	33.00%	33.00%
D	23.00%	22.00%	31.00%	30.00%	36.00%	42.00%	49.00%
E	35.00%	41.00%	49.00%	40.00%	48.00%	48.00%	53.00%
F	19.00%	20.00%	33.00%	16.00%	20.00%	26.00%	28.00%


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