20.3% is the change from 266 to 320
Calculation steps:
[( 320 - 266 ) ÷ 266] x 100 = 20.3%
Formula
Percentage change = [(320 - 266) / 266] x 100
Subtract the new number by the original number
320 - 266 = 54
54 ÷ 266 = 0.20300751879699247
0.20300751879699247 x 100 = 20.3%