246.4% is the change from 250 to 866
Calculation steps:
[( 866 - 250 ) ÷ 250] x 100 = 246.4%
Formula
Percentage change = [(866 - 250) / 250] x 100
Subtract the new number by the original number
866 - 250 = 616
616 ÷ 250 = 2.464
2.464 x 100 = 246.4%
Example