375% is the change from 136 to 646
Calculation steps:
[( 646 - 136 ) ÷ 136] x 100 = 375%
Formula
Percentage change = [(646 - 136) / 136] x 100
Subtract the new number by the original number
646 - 136 = 510
510 ÷ 136 = 3.75
3.75 x 100 = 375%
Example