7.22% is the change from 291 to 312
Calculation steps:
[( 312 - 291 ) ÷ 291] x 100 = 7.22%
Formula
Percentage change = [(312 - 291) / 291] x 100
Subtract the new number by the original number
312 - 291 = 21
21 ÷ 291 = 0.07216494845360824
0.07216494845360824 x 100 = 7.22%