-29.57% is the change from 345 to 243
Calculation steps:
[( 243 - 345 ) ÷ 345] x 100 = -29.57%
Formula
Percentage change = [(243 - 345) / 345] x 100
Subtract the new number by the original number
243 - 345 = -102
-102 ÷ 345 = -0.2956521739130435
-0.2956521739130435 x 100 = -29.57%