-16.75% is the change from 615 to 512
Calculation steps:
[( 512 - 615 ) ÷ 615] x 100 = -16.75%
Formula
Percentage change = [(512 - 615) / 615] x 100
Subtract the new number by the original number
512 - 615 = -103
-103 ÷ 615 = -0.16747967479674797
-0.16747967479674797 x 100 = -16.75%