-40.04% is the change from 507 to 304
Calculation steps:
[( 304 - 507 ) ÷ 507] x 100 = -40.04%
Formula
Percentage change = [(304 - 507) / 507] x 100
Subtract the new number by the original number
304 - 507 = -203
-203 ÷ 507 = -0.40039447731755423
-0.40039447731755423 x 100 = -40.04%