18.6% is the change from 258 to 306
Calculation steps:
[( 306 - 258 ) ÷ 258] x 100 = 18.6%
Formula
Percentage change = [(306 - 258) / 258] x 100
Subtract the new number by the original number
306 - 258 = 48
48 ÷ 258 = 0.18604651162790697
0.18604651162790697 x 100 = 18.6%