-30.99% is the change from 797 to 550
Calculation steps:
[( 550 - 797 ) ÷ 797] x 100 = -30.99%
Formula
Percentage change = [(550 - 797) / 797] x 100
Subtract the new number by the original number
550 - 797 = -247
-247 ÷ 797 = -0.3099121706398996
-0.3099121706398996 x 100 = -30.99%