1300% is the change from 21 to 294
Calculation steps:
[( 294 - 21 ) ÷ 21] x 100 = 1300%
Formula
Percentage change = [(294 - 21) / 21] x 100
Subtract the new number by the original number
294 - 21 = 273
273 ÷ 21 = 13
13 x 100 = 1300%
Example