100% is the change from 258 to 516
Calculation steps:
[( 516 - 258 ) ÷ 258] x 100 = 100%
Formula
Percentage change = [(516 - 258) / 258] x 100
Subtract the new number by the original number
516 - 258 = 258
258 ÷ 258 = 1
1 x 100 = 100%
Example