-48.47% is the change from 817 to 421
Calculation steps:
[( 421 - 817 ) ÷ 817] x 100 = -48.47%
Formula
Percentage change = [(421 - 817) / 817] x 100
Subtract the new number by the original number
421 - 817 = -396
-396 ÷ 817 = -0.4847001223990208
-0.4847001223990208 x 100 = -48.47%