-81.48% is the change from 243 to 45
Calculation steps:
[( 45 - 243 ) ÷ 243] x 100 = -81.48%
Formula
Percentage change = [(45 - 243) / 243] x 100
Subtract the new number by the original number
45 - 243 = -198
-198 ÷ 243 = -0.8148148148148148
-0.8148148148148148 x 100 = -81.48%
Example