144.81% is the change from 270 to 661
Calculation steps:
[( 661 - 270 ) ÷ 270] x 100 = 144.81%
Formula
Percentage change = [(661 - 270) / 270] x 100
Subtract the new number by the original number
661 - 270 = 391
391 ÷ 270 = 1.4481481481481482
1.4481481481481482 x 100 = 144.81%