300% is the change from 160 to 640
Calculation steps:
[( 640 - 160 ) ÷ 160] x 100 = 300%
Formula
Percentage change = [(640 - 160) / 160] x 100
Subtract the new number by the original number
640 - 160 = 480
480 ÷ 160 = 3
3 x 100 = 300%
Example