300% is the change from 102 to 408
Calculation steps:
[( 408 - 102 ) ÷ 102] x 100 = 300%
Formula
Percentage change = [(408 - 102) / 102] x 100
Subtract the new number by the original number
408 - 102 = 306
306 ÷ 102 = 3
3 x 100 = 300%
Example