396.3% is the change from 135 to 670
Calculation steps:
[( 670 - 135 ) ÷ 135] x 100 = 396.3%
Formula
Percentage change = [(670 - 135) / 135] x 100
Subtract the new number by the original number
670 - 135 = 535
535 ÷ 135 = 3.962962962962963
3.962962962962963 x 100 = 396.3%