[R] Percent of a given subset

[jcrosbie]

How would I find the Percent of FuelTypeNum	within the Band given 
AvailableMW?

example:
type 1 is 1%  of PB0 
type 2 is 54%  of PB0 
 type 4 is 4%  of PB0 
 type 5 is 42%  of PB0 


Note:   the Bands and fuel types are not always constant. 

Data:
FuelTypeNum	Bands	AvailableMW	AvailableMWNewFormat
1	PB0	185319	185.319
2	PB0	18352000	18352
4	PB0	1338785	1338.785
5	PB0	14189756	14189.756
2	PB1	48229	48.229
5	PB1	792433	792.433
2	PB2	7034959	7034.959
4	PB2	796	0.796
5	PB2	1652519	1652.519
1	PB3	16	0.016
2	PB3	11633	11.633
4	PB3	8076	8.076
5	PB3	97410	97.41
1	PB4	4610	4.61
2	PB4	3048	3.048
4	PB4	1117	1.117
5	PB4	28097	28.097
1	PB5	1155	1.155
2	PB5	5331	5.331
4	PB5	2491	2.491
5	PB5	12887	12.887
1	PB6	4	0.004
2	PB6	5774	5.774
4	PB6	2643	2.643
5	PB6	25475	25.475
1	PB7	133	0.133
2	PB7	3787	3.787
4	PB7	750	0.75
5	PB7	10682	10.682
http://r.789695.n4.nabble.com/file/n4632857/Rdata.xlsx Rdata.xlsx 

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