98.05% is the change from 256 to 507
Calculation steps:
[( 507 - 256 ) ÷ 256] x 100 = 98.05%
Formula
Percentage change = [(507 - 256) / 256] x 100
Subtract the new number by the original number
507 - 256 = 251
251 ÷ 256 = 0.98046875
0.98046875 x 100 = 98.05%