13.36% is the change from 247 to 280
Calculation steps:
[( 280 - 247 ) ÷ 247] x 100 = 13.36%
Formula
Percentage change = [(280 - 247) / 247] x 100
Subtract the new number by the original number
280 - 247 = 33
33 ÷ 247 = 0.13360323886639677
0.13360323886639677 x 100 = 13.36%