1528.57% is the change from 21 to 342
Calculation steps:
[( 342 - 21 ) ÷ 21] x 100 = 1528.57%
Formula
Percentage change = [(342 - 21) / 21] x 100
Subtract the new number by the original number
342 - 21 = 321
321 ÷ 21 = 15.285714285714286
15.285714285714286 x 100 = 1528.57%