-38.77% is the change from 503 to 308
Calculation steps:
[( 308 - 503 ) ÷ 503] x 100 = -38.77%
Formula
Percentage change = [(308 - 503) / 503] x 100
Subtract the new number by the original number
308 - 503 = -195
-195 ÷ 503 = -0.38767395626242546
-0.38767395626242546 x 100 = -38.77%