-77.32% is the change from 507 to 115
Calculation steps:
[( 115 - 507 ) ÷ 507] x 100 = -77.32%
Formula
Percentage change = [(115 - 507) / 507] x 100
Subtract the new number by the original number
115 - 507 = -392
-392 ÷ 507 = -0.7731755424063116
-0.7731755424063116 x 100 = -77.32%