77.27% is the change from 550 to 975
Calculation steps:
[( 975 - 550 ) ÷ 550] x 100 = 77.27%
Formula
Percentage change = [(975 - 550) / 550] x 100
Subtract the new number by the original number
975 - 550 = 425
425 ÷ 550 = 0.7727272727272727
0.7727272727272727 x 100 = 77.27%