-43.9% is the change from 615 to 345
Calculation steps:
[( 345 - 615 ) ÷ 615] x 100 = -43.9%
Formula
Percentage change = [(345 - 615) / 615] x 100
Subtract the new number by the original number
345 - 615 = -270
-270 ÷ 615 = -0.43902439024390244
-0.43902439024390244 x 100 = -43.9%