1542.86% is the change from 21 to 345
Calculation steps:
[( 345 - 21 ) ÷ 21] x 100 = 1542.86%
Formula
Percentage change = [(345 - 21) / 21] x 100
Subtract the new number by the original number
345 - 21 = 324
324 ÷ 21 = 15.428571428571429
15.428571428571429 x 100 = 1542.86%