243% is the change from 100 to 343
Calculation steps:
[( 343 - 100 ) ÷ 100] x 100 = 243%
Formula
Percentage change = [(343 - 100) / 100] x 100
Subtract the new number by the original number
343 - 100 = 243
243 ÷ 100 = 2.43
2.43 x 100 = 243%
Example