1376.19% is the change from 21 to 310
Calculation steps:
[( 310 - 21 ) ÷ 21] x 100 = 1376.19%
Formula
Percentage change = [(310 - 21) / 21] x 100
Subtract the new number by the original number
310 - 21 = 289
289 ÷ 21 = 13.761904761904763
13.761904761904763 x 100 = 1376.19%