-55.03% is the change from 507 to 228
Calculation steps:
[( 228 - 507 ) ÷ 507] x 100 = -55.03%
Formula
Percentage change = [(228 - 507) / 507] x 100
Subtract the new number by the original number
228 - 507 = -279
-279 ÷ 507 = -0.5502958579881657
-0.5502958579881657 x 100 = -55.03%