First find the total number of scrunchies: 6 barrettes * 2 = <<6*2=12>>12 scrunchies
Then subtract three fewer bobby pins than barrettes 6-3 =<<6-3=3>>3 bobby pins
Then add the number of each type of hair decorations to find the total number: 6 decorations + 12 decorations + 3 decorations = <<6+12+3=21>>21 decorations
Then divide the number of bobby pins by the total number of decorations and multiply by 100% to express the answer as a percentage: 3 bobby pins / 21 decorations * 100% = 14.28 which rounds down to 14%
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