-5.63% is the change from 320 to 302
Calculation steps:
[( 302 - 320 ) ÷ 320] x 100 = -5.63%
Formula
Percentage change = [(302 - 320) / 320] x 100
Subtract the new number by the original number
302 - 320 = -18
-18 ÷ 320 = -0.05625
-0.05625 x 100 = -5.63%