921.57% is the change from 51 to 521
Calculation steps:
[( 521 - 51 ) ÷ 51] x 100 = 921.57%
Formula
Percentage change = [(521 - 51) / 51] x 100
Subtract the new number by the original number
521 - 51 = 470
470 ÷ 51 = 9.215686274509803
9.215686274509803 x 100 = 921.57%