99.61% is the change from 257 to 513
Calculation steps:
[( 513 - 257 ) ÷ 257] x 100 = 99.61%
Formula
Percentage change = [(513 - 257) / 257] x 100
Subtract the new number by the original number
513 - 257 = 256
256 ÷ 257 = 0.9961089494163424
0.9961089494163424 x 100 = 99.61%