4031.25% is the change from 16 to 661
Calculation steps:
[( 661 - 16 ) ÷ 16] x 100 = 4031.25%
Formula
Percentage change = [(661 - 16) / 16] x 100
Subtract the new number by the original number
661 - 16 = 645
645 ÷ 16 = 40.3125
40.3125 x 100 = 4031.25%