Answer:
25%
Explanation:
You can convert this amount into a fraction first, and then convert that fraction into a percentage. 3 out of 12 beads would be 3/12 as a fraction; pretty easy. Simplify this fraction to make the conversion easier. 3 and 12 are both divisible by 3, so you can do this:
3/3 = 1
12/3 = 4
New fraction = 1/4
You need 4 fourths to get to a whole, and 100/4 = 25, so you can determine that 25% of Amy's necklace is blue.
I hope this helped!! :)