30.12% is the change from 166 to 216
Calculation steps:
[( 216 - 166 ) ÷ 166] x 100 = 30.12%
Formula
Percentage change = [(216 - 166) / 166] x 100
Subtract the new number by the original number
216 - 166 = 50
50 ÷ 166 = 0.30120481927710846
0.30120481927710846 x 100 = 30.12%