258.33% is the change from 240 to 860
Calculation steps:
[( 860 - 240 ) ÷ 240] x 100 = 258.33%
Formula
Percentage change = [(860 - 240) / 240] x 100
Subtract the new number by the original number
860 - 240 = 620
620 ÷ 240 = 2.5833333333333335
2.5833333333333335 x 100 = 258.33%