In 1994, school lunch at Rockwell High School was $1.20. In 1999, the cost increased to $2.25. Find the annual rate of change in the price for school lunch from 1994 to 1999.
a.
$0.18 per year
c.
$0.20 per year
b.
$0.21 per year
d.
$1.05 per year