107.57% is the change from 251 to 521
Calculation steps:
[( 521 - 251 ) ÷ 251] x 100 = 107.57%
Formula
Percentage change = [(521 - 251) / 251] x 100
Subtract the new number by the original number
521 - 251 = 270
270 ÷ 251 = 1.0756972111553784
1.0756972111553784 x 100 = 107.57%