291.18% is the change from 102 to 399
Calculation steps:
[( 399 - 102 ) ÷ 102] x 100 = 291.18%
Formula
Percentage change = [(399 - 102) / 102] x 100
Subtract the new number by the original number
399 - 102 = 297
297 ÷ 102 = 2.911764705882353
2.911764705882353 x 100 = 291.18%