240.4% is the change from 250 to 851
Calculation steps:
[( 851 - 250 ) ÷ 250] x 100 = 240.4%
Formula
Percentage change = [(851 - 250) / 250] x 100
Subtract the new number by the original number
851 - 250 = 601
601 ÷ 250 = 2.404
2.404 x 100 = 240.4%
Example