167.5% is the change from 320 to 856
Calculation steps:
[( 856 - 320 ) ÷ 320] x 100 = 167.5%
Formula
Percentage change = [(856 - 320) / 320] x 100
Subtract the new number by the original number
856 - 320 = 536
536 ÷ 320 = 1.675
1.675 x 100 = 167.5%
Example