-77.42% is the change from 93 to 21
Calculation steps:
[( 21 - 93 ) ÷ 93] x 100 = -77.42%
Formula
Percentage change = [(21 - 93) / 93] x 100
Subtract the new number by the original number
21 - 93 = -72
-72 ÷ 93 = -0.7741935483870968
-0.7741935483870968 x 100 = -77.42%