45.45% is the change from 550 to 800
Calculation steps:
[( 800 - 550 ) ÷ 550] x 100 = 45.45%
Formula
Percentage change = [(800 - 550) / 550] x 100
Subtract the new number by the original number
800 - 550 = 250
250 ÷ 550 = 0.45454545454545453
0.45454545454545453 x 100 = 45.45%