101.99% is the change from 251 to 507
Calculation steps:
[( 507 - 251 ) ÷ 251] x 100 = 101.99%
Formula
Percentage change = [(507 - 251) / 251] x 100
Subtract the new number by the original number
507 - 251 = 256
256 ÷ 251 = 1.0199203187250996
1.0199203187250996 x 100 = 101.99%