51.83% is the change from 218 to 331
Calculation steps:
[( 331 - 218 ) ÷ 218] x 100 = 51.83%
Formula
Percentage change = [(331 - 218) / 218] x 100
Subtract the new number by the original number
331 - 218 = 113
113 ÷ 218 = 0.518348623853211
0.518348623853211 x 100 = 51.83%