-38.97% is the change from 503 to 307
Calculation steps:
[( 307 - 503 ) ÷ 503] x 100 = -38.97%
Formula
Percentage change = [(307 - 503) / 503] x 100
Subtract the new number by the original number
307 - 503 = -196
-196 ÷ 503 = -0.38966202783300197
-0.38966202783300197 x 100 = -38.97%