-60.91% is the change from 550 to 215
Calculation steps:
[( 215 - 550 ) ÷ 550] x 100 = -60.91%
Formula
Percentage change = [(215 - 550) / 550] x 100
Subtract the new number by the original number
215 - 550 = -335
-335 ÷ 550 = -0.6090909090909091
-0.6090909090909091 x 100 = -60.91%