400% is the change from 71 to 355
Calculation steps:
[( 355 - 71 ) ÷ 71] x 100 = 400%
Formula
Percentage change = [(355 - 71) / 71] x 100
Subtract the new number by the original number
355 - 71 = 284
284 ÷ 71 = 4
4 x 100 = 400%
Example