121.15% is the change from 156 to 345
Calculation steps:
[( 345 - 156 ) ÷ 156] x 100 = 121.15%
Formula
Percentage change = [(345 - 156) / 156] x 100
Subtract the new number by the original number
345 - 156 = 189
189 ÷ 156 = 1.2115384615384615
1.2115384615384615 x 100 = 121.15%