-20% is the change from 355 to 284
Calculation steps:
[( 284 - 355 ) ÷ 355] x 100 = -20%
Formula
Percentage change = [(284 - 355) / 355] x 100
Subtract the new number by the original number
284 - 355 = -71
-71 ÷ 355 = -0.2
-0.2 x 100 = -20%
Example