1228.57% is the change from 21 to 279
Calculation steps:
[( 279 - 21 ) ÷ 21] x 100 = 1228.57%
Formula
Percentage change = [(279 - 21) / 21] x 100
Subtract the new number by the original number
279 - 21 = 258
258 ÷ 21 = 12.285714285714286
12.285714285714286 x 100 = 1228.57%