384.85% is the change from 66 to 320
Calculation steps:
[( 320 - 66 ) ÷ 66] x 100 = 384.85%
Formula
Percentage change = [(320 - 66) / 66] x 100
Subtract the new number by the original number
320 - 66 = 254
254 ÷ 66 = 3.8484848484848486
3.8484848484848486 x 100 = 384.85%