210% is the change from 40 to 124
Calculation steps:
[( 124 - 40 ) ÷ 40] x 100 = 210%
Formula
Percentage change = [(124 - 40) / 40] x 100
Subtract the new number by the original number
124 - 40 = 84
84 ÷ 40 = 2.1
2.1 x 100 = 210%
Example