1450% is the change from 40 to 620
Calculation steps:
[( 620 - 40 ) ÷ 40] x 100 = 1450%
Formula
Percentage change = [(620 - 40) / 40] x 100
Subtract the new number by the original number
620 - 40 = 580
580 ÷ 40 = 14.5
14.5 x 100 = 1450%
Example