8.77% is the change from 228 to 248
Calculation steps:
[( 248 - 228 ) ÷ 228] x 100 = 8.77%
Formula
Percentage change = [(248 - 228) / 228] x 100
Subtract the new number by the original number
248 - 228 = 20
20 ÷ 228 = 0.08771929824561403
0.08771929824561403 x 100 = 8.77%