-8.68% is the change from 242 to 221
Calculation steps:
[( 221 - 242 ) ÷ 242] x 100 = -8.68%
Formula
Percentage change = [(221 - 242) / 242] x 100
Subtract the new number by the original number
221 - 242 = -21
-21 ÷ 242 = -0.08677685950413223
-0.08677685950413223 x 100 = -8.68%