1615% is the change from 20 to 343
Calculation steps:
[( 343 - 20 ) ÷ 20] x 100 = 1615%
Formula
Percentage change = [(343 - 20) / 20] x 100
Subtract the new number by the original number
343 - 20 = 323
323 ÷ 20 = 16.15
16.15 x 100 = 1615%
Example