-6.48% is the change from 247 to 231
Calculation steps:
[( 231 - 247 ) ÷ 247] x 100 = -6.48%
Formula
Percentage change = [(231 - 247) / 247] x 100
Subtract the new number by the original number
231 - 247 = -16
-16 ÷ 247 = -0.06477732793522267
-0.06477732793522267 x 100 = -6.48%