20.93% is the change from 258 to 312
Calculation steps:
[( 312 - 258 ) ÷ 258] x 100 = 20.93%
Formula
Percentage change = [(312 - 258) / 258] x 100
Subtract the new number by the original number
312 - 258 = 54
54 ÷ 258 = 0.20930232558139536
0.20930232558139536 x 100 = 20.93%