-90% is the change from 530 to 53
Calculation steps:
[( 53 - 530 ) ÷ 530] x 100 = -90%
Formula
Percentage change = [(53 - 530) / 530] x 100
Subtract the new number by the original number
53 - 530 = -477
-477 ÷ 530 = -0.9
-0.9 x 100 = -90%
Example