12.17% is the change from 345 to 387
Calculation steps:
[( 387 - 345 ) ÷ 345] x 100 = 12.17%
Formula
Percentage change = [(387 - 345) / 345] x 100
Subtract the new number by the original number
387 - 345 = 42
42 ÷ 345 = 0.12173913043478261
0.12173913043478261 x 100 = 12.17%