528.75% is the change from 80 to 503
Calculation steps:
[( 503 - 80 ) ÷ 80] x 100 = 528.75%
Formula
Percentage change = [(503 - 80) / 80] x 100
Subtract the new number by the original number
503 - 80 = 423
423 ÷ 80 = 5.2875
5.2875 x 100 = 528.75%
Example