-18.11% is the change from 784 to 642
Calculation steps:
[( 642 - 784 ) ÷ 784] x 100 = -18.11%
Formula
Percentage change = [(642 - 784) / 784] x 100
Subtract the new number by the original number
642 - 784 = -142
-142 ÷ 784 = -0.18112244897959184
-0.18112244897959184 x 100 = -18.11%