80.18% is the change from 550 to 991
Calculation steps:
[( 991 - 550 ) ÷ 550] x 100 = 80.18%
Formula
Percentage change = [(991 - 550) / 550] x 100
Subtract the new number by the original number
991 - 550 = 441
441 ÷ 550 = 0.8018181818181818
0.8018181818181818 x 100 = 80.18%