-29.15% is the change from 343 to 243
Calculation steps:
[( 243 - 343 ) ÷ 343] x 100 = -29.15%
Formula
Percentage change = [(243 - 343) / 343] x 100
Subtract the new number by the original number
243 - 343 = -100
-100 ÷ 343 = -0.2915451895043732
-0.2915451895043732 x 100 = -29.15%