350% is the change from 84 to 378
Calculation steps:
[( 378 - 84 ) ÷ 84] x 100 = 350%
Formula
Percentage change = [(378 - 84) / 84] x 100
Subtract the new number by the original number
378 - 84 = 294
294 ÷ 84 = 3.5
3.5 x 100 = 350%
Example