-18.6% is the change from 215 to 175
Calculation steps:
[( 175 - 215 ) ÷ 215] x 100 = -18.6%
Formula
Percentage change = [(175 - 215) / 215] x 100
Subtract the new number by the original number
175 - 215 = -40
-40 ÷ 215 = -0.18604651162790697
-0.18604651162790697 x 100 = -18.6%