156.56% is the change from 320 to 821
Calculation steps:
[( 821 - 320 ) ÷ 320] x 100 = 156.56%
Formula
Percentage change = [(821 - 320) / 320] x 100
Subtract the new number by the original number
821 - 320 = 501
501 ÷ 320 = 1.565625
1.565625 x 100 = 156.56%