187.5% is the change from 120 to 345
Calculation steps:
[( 345 - 120 ) ÷ 120] x 100 = 187.5%
Formula
Percentage change = [(345 - 120) / 120] x 100
Subtract the new number by the original number
345 - 120 = 225
225 ÷ 120 = 1.875
1.875 x 100 = 187.5%
Example