50.55% is the change from 550 to 828
Calculation steps:
[( 828 - 550 ) ÷ 550] x 100 = 50.55%
Formula
Percentage change = [(828 - 550) / 550] x 100
Subtract the new number by the original number
828 - 550 = 278
278 ÷ 550 = 0.5054545454545455
0.5054545454545455 x 100 = 50.55%