268.4% is the change from 250 to 921
Calculation steps:
[( 921 - 250 ) ÷ 250] x 100 = 268.4%
Formula
Percentage change = [(921 - 250) / 250] x 100
Subtract the new number by the original number
921 - 250 = 671
671 ÷ 250 = 2.684
2.684 x 100 = 268.4%
Example