17.81% is the change from 320 to 377
Calculation steps:
[( 377 - 320 ) ÷ 320] x 100 = 17.81%
Formula
Percentage change = [(377 - 320) / 320] x 100
Subtract the new number by the original number
377 - 320 = 57
57 ÷ 320 = 0.178125
0.178125 x 100 = 17.81%