1385.71% is the change from 21 to 312
Calculation steps:
[( 312 - 21 ) ÷ 21] x 100 = 1385.71%
Formula
Percentage change = [(312 - 21) / 21] x 100
Subtract the new number by the original number
312 - 21 = 291
291 ÷ 21 = 13.857142857142858
13.857142857142858 x 100 = 1385.71%