501.52% is the change from 66 to 397
Calculation steps:
[( 397 - 66 ) ÷ 66] x 100 = 501.52%
Formula
Percentage change = [(397 - 66) / 66] x 100
Subtract the new number by the original number
397 - 66 = 331
331 ÷ 66 = 5.015151515151516
5.015151515151516 x 100 = 501.52%