-13% is the change from 577 to 502
Calculation steps:
[( 502 - 577 ) ÷ 577] x 100 = -13%
Formula
Percentage change = [(502 - 577) / 577] x 100
Subtract the new number by the original number
502 - 577 = -75
-75 ÷ 577 = -0.12998266897746968
-0.12998266897746968 x 100 = -13%