8.79% is the change from 387 to 421
Calculation steps:
[( 421 - 387 ) ÷ 387] x 100 = 8.79%
Formula
Percentage change = [(421 - 387) / 387] x 100
Subtract the new number by the original number
421 - 387 = 34
34 ÷ 387 = 0.08785529715762273
0.08785529715762273 x 100 = 8.79%