-93.75% is the change from 336 to 21
Calculation steps:
[( 21 - 336 ) ÷ 336] x 100 = -93.75%
Formula
Percentage change = [(21 - 336) / 336] x 100
Subtract the new number by the original number
21 - 336 = -315
-315 ÷ 336 = -0.9375
-0.9375 x 100 = -93.75%