8.53% is the change from 387 to 420
Calculation steps:
[( 420 - 387 ) ÷ 387] x 100 = 8.53%
Formula
Percentage change = [(420 - 387) / 387] x 100
Subtract the new number by the original number
420 - 387 = 33
33 ÷ 387 = 0.08527131782945736
0.08527131782945736 x 100 = 8.53%