There are 100 students in a band. Forty percent are 12 years old, 1/2 are 13 years old, and the rest are 14 years old. Write the portion of the band for each age as a fraction and a percent.
12-year olds: fraction: ____ , percent: ____ %
13-year olds: fraction: ____ , percent: ____ %
14-year olds: fraction: ____ , percent: ____ %