-98.94% is the change from 660 to 7
Calculation steps:
[( 7 - 660 ) ÷ 660] x 100 = -98.94%
Formula
Percentage change = [(7 - 660) / 660] x 100
Subtract the new number by the original number
7 - 660 = -653
-653 ÷ 660 = -0.9893939393939394
-0.9893939393939394 x 100 = -98.94%