350% is the change from 40 to 180
Calculation steps:
[( 180 - 40 ) ÷ 40] x 100 = 350%
Formula
Percentage change = [(180 - 40) / 40] x 100
Subtract the new number by the original number
180 - 40 = 140
140 ÷ 40 = 3.5
3.5 x 100 = 350%
Example