-15.5% is the change from 600 to 507
Calculation steps:
[( 507 - 600 ) ÷ 600] x 100 = -15.5%
Formula
Percentage change = [(507 - 600) / 600] x 100
Subtract the new number by the original number
507 - 600 = -93
-93 ÷ 600 = -0.155
-0.155 x 100 = -15.5%