21.49% is the change from 228 to 277
Calculation steps:
[( 277 - 228 ) ÷ 228] x 100 = 21.49%
Formula
Percentage change = [(277 - 228) / 228] x 100
Subtract the new number by the original number
277 - 228 = 49
49 ÷ 228 = 0.2149122807017544
0.2149122807017544 x 100 = 21.49%