-27.61% is the change from 297 to 215
Calculation steps:
[( 215 - 297 ) ÷ 297] x 100 = -27.61%
Formula
Percentage change = [(215 - 297) / 297] x 100
Subtract the new number by the original number
215 - 297 = -82
-82 ÷ 297 = -0.2760942760942761
-0.2760942760942761 x 100 = -27.61%