979.49% is the change from 39 to 421
Calculation steps:
[( 421 - 39 ) ÷ 39] x 100 = 979.49%
Formula
Percentage change = [(421 - 39) / 39] x 100
Subtract the new number by the original number
421 - 39 = 382
382 ÷ 39 = 9.794871794871796
9.794871794871796 x 100 = 979.49%