-92.87% is the change from 421 to 30
Calculation steps:
[( 30 - 421 ) ÷ 421] x 100 = -92.87%
Formula
Percentage change = [(30 - 421) / 421] x 100
Subtract the new number by the original number
30 - 421 = -391
-391 ÷ 421 = -0.9287410926365796
-0.9287410926365796 x 100 = -92.87%