150% is the change from 320 to 800
Calculation steps:
[( 800 - 320 ) ÷ 320] x 100 = 150%
Formula
Percentage change = [(800 - 320) / 320] x 100
Subtract the new number by the original number
800 - 320 = 480
480 ÷ 320 = 1.5
1.5 x 100 = 150%
Example