-17.76% is the change from 642 to 528
Calculation steps:
[( 528 - 642 ) ÷ 642] x 100 = -17.76%
Formula
Percentage change = [(528 - 642) / 642] x 100
Subtract the new number by the original number
528 - 642 = -114
-114 ÷ 642 = -0.17757009345794392
-0.17757009345794392 x 100 = -17.76%