144.44% is the change from 270 to 660
Calculation steps:
[( 660 - 270 ) ÷ 270] x 100 = 144.44%
Formula
Percentage change = [(660 - 270) / 270] x 100
Subtract the new number by the original number
660 - 270 = 390
390 ÷ 270 = 1.4444444444444444
1.4444444444444444 x 100 = 144.44%