1552.38% is the change from 21 to 347
Calculation steps:
[( 347 - 21 ) ÷ 21] x 100 = 1552.38%
Formula
Percentage change = [(347 - 21) / 21] x 100
Subtract the new number by the original number
347 - 21 = 326
326 ÷ 21 = 15.523809523809524
15.523809523809524 x 100 = 1552.38%