3893.75% is the change from 16 to 639
Calculation steps:
[( 639 - 16 ) ÷ 16] x 100 = 3893.75%
Formula
Percentage change = [(639 - 16) / 16] x 100
Subtract the new number by the original number
639 - 16 = 623
623 ÷ 16 = 38.9375
38.9375 x 100 = 3893.75%