-87.04% is the change from 324 to 42
Calculation steps:
[( 42 - 324 ) ÷ 324] x 100 = -87.04%
Formula
Percentage change = [(42 - 324) / 324] x 100
Subtract the new number by the original number
42 - 324 = -282
-282 ÷ 324 = -0.8703703703703703
-0.8703703703703703 x 100 = -87.04%