7.75% is the change from 258 to 278
Calculation steps:
[( 278 - 258 ) ÷ 258] x 100 = 7.75%
Formula
Percentage change = [(278 - 258) / 258] x 100
Subtract the new number by the original number
278 - 258 = 20
20 ÷ 258 = 0.07751937984496124
0.07751937984496124 x 100 = 7.75%