-90% is the change from 730 to 73
Calculation steps:
[( 73 - 730 ) ÷ 730] x 100 = -90%
Formula
Percentage change = [(73 - 730) / 730] x 100
Subtract the new number by the original number
73 - 730 = -657
-657 ÷ 730 = -0.9
-0.9 x 100 = -90%
Example