-47.73% is the change from 660 to 345
Calculation steps:
[( 345 - 660 ) ÷ 660] x 100 = -47.73%
Formula
Percentage change = [(345 - 660) / 660] x 100
Subtract the new number by the original number
345 - 660 = -315
-315 ÷ 660 = -0.4772727272727273
-0.4772727272727273 x 100 = -47.73%