290.24% is the change from 82 to 320
Calculation steps:
[( 320 - 82 ) ÷ 82] x 100 = 290.24%
Formula
Percentage change = [(320 - 82) / 82] x 100
Subtract the new number by the original number
320 - 82 = 238
238 ÷ 82 = 2.902439024390244
2.902439024390244 x 100 = 290.24%