266.93% is the change from 251 to 921
Calculation steps:
[( 921 - 251 ) ÷ 251] x 100 = 266.93%
Formula
Percentage change = [(921 - 251) / 251] x 100
Subtract the new number by the original number
921 - 251 = 670
670 ÷ 251 = 2.6693227091633465
2.6693227091633465 x 100 = 266.93%