-17.91% is the change from 642 to 527
Calculation steps:
[( 527 - 642 ) ÷ 642] x 100 = -17.91%
Formula
Percentage change = [(527 - 642) / 642] x 100
Subtract the new number by the original number
527 - 642 = -115
-115 ÷ 642 = -0.1791277258566978
-0.1791277258566978 x 100 = -17.91%