-49.3% is the change from 215 to 109
Calculation steps:
[( 109 - 215 ) ÷ 215] x 100 = -49.3%
Formula
Percentage change = [(109 - 215) / 215] x 100
Subtract the new number by the original number
109 - 215 = -106
-106 ÷ 215 = -0.4930232558139535
-0.4930232558139535 x 100 = -49.3%