-90.7% is the change from 215 to 20
Calculation steps:
[( 20 - 215 ) ÷ 215] x 100 = -90.7%
Formula
Percentage change = [(20 - 215) / 215] x 100
Subtract the new number by the original number
20 - 215 = -195
-195 ÷ 215 = -0.9069767441860465
-0.9069767441860465 x 100 = -90.7%