-75.77% is the change from 421 to 102
Calculation steps:
[( 102 - 421 ) ÷ 421] x 100 = -75.77%
Formula
Percentage change = [(102 - 421) / 421] x 100
Subtract the new number by the original number
102 - 421 = -319
-319 ÷ 421 = -0.7577197149643705
-0.7577197149643705 x 100 = -75.77%