250% is the change from 260 to 910
Calculation steps:
[( 910 - 260 ) ÷ 260] x 100 = 250%
Formula
Percentage change = [(910 - 260) / 260] x 100
Subtract the new number by the original number
910 - 260 = 650
650 ÷ 260 = 2.5
2.5 x 100 = 250%
Example