1214.29% is the change from 21 to 276
Calculation steps:
[( 276 - 21 ) ÷ 21] x 100 = 1214.29%
Formula
Percentage change = [(276 - 21) / 21] x 100
Subtract the new number by the original number
276 - 21 = 255
255 ÷ 21 = 12.142857142857142
12.142857142857142 x 100 = 1214.29%