250% is the change from 270 to 945
Calculation steps:
[( 945 - 270 ) ÷ 270] x 100 = 250%
Formula
Percentage change = [(945 - 270) / 270] x 100
Subtract the new number by the original number
945 - 270 = 675
675 ÷ 270 = 2.5
2.5 x 100 = 250%
Example