-36.88% is the change from 507 to 320
Calculation steps:
[( 320 - 507 ) ÷ 507] x 100 = -36.88%
Formula
Percentage change = [(320 - 507) / 507] x 100
Subtract the new number by the original number
320 - 507 = -187
-187 ÷ 507 = -0.368836291913215
-0.368836291913215 x 100 = -36.88%