620% is the change from 40 to 288
Calculation steps:
[( 288 - 40 ) ÷ 40] x 100 = 620%
Formula
Percentage change = [(288 - 40) / 40] x 100
Subtract the new number by the original number
288 - 40 = 248
248 ÷ 40 = 6.2
6.2 x 100 = 620%
Example