35.05% is the change from 311 to 420
Calculation steps:
[( 420 - 311 ) ÷ 311] x 100 = 35.05%
Formula
Percentage change = [(420 - 311) / 311] x 100
Subtract the new number by the original number
420 - 311 = 109
109 ÷ 311 = 0.3504823151125402
0.3504823151125402 x 100 = 35.05%