-34.85% is the change from 330 to 215
Calculation steps:
[( 215 - 330 ) ÷ 330] x 100 = -34.85%
Formula
Percentage change = [(215 - 330) / 330] x 100
Subtract the new number by the original number
215 - 330 = -115
-115 ÷ 330 = -0.3484848484848485
-0.3484848484848485 x 100 = -34.85%