-77.73% is the change from 660 to 147
Calculation steps:
[( 147 - 660 ) ÷ 660] x 100 = -77.73%
Formula
Percentage change = [(147 - 660) / 660] x 100
Subtract the new number by the original number
147 - 660 = -513
-513 ÷ 660 = -0.7772727272727272
-0.7772727272727272 x 100 = -77.73%