33.44% is the change from 320 to 427
Calculation steps:
[( 427 - 320 ) ÷ 320] x 100 = 33.44%
Formula
Percentage change = [(427 - 320) / 320] x 100
Subtract the new number by the original number
427 - 320 = 107
107 ÷ 320 = 0.334375
0.334375 x 100 = 33.44%