486.36% is the change from 66 to 387
Calculation steps:
[( 387 - 66 ) ÷ 66] x 100 = 486.36%
Formula
Percentage change = [(387 - 66) / 66] x 100
Subtract the new number by the original number
387 - 66 = 321
321 ÷ 66 = 4.863636363636363
4.863636363636363 x 100 = 486.36%