990% is the change from 50 to 545
Calculation steps:
[( 545 - 50 ) ÷ 50] x 100 = 990%
Formula
Percentage change = [(545 - 50) / 50] x 100
Subtract the new number by the original number
545 - 50 = 495
495 ÷ 50 = 9.9
9.9 x 100 = 990%
Example