-18.14% is the change from 645 to 528
Calculation steps:
[( 528 - 645 ) ÷ 645] x 100 = -18.14%
Formula
Percentage change = [(528 - 645) / 645] x 100
Subtract the new number by the original number
528 - 645 = -117
-117 ÷ 645 = -0.1813953488372093
-0.1813953488372093 x 100 = -18.14%