-37.88% is the change from 850 to 528
Calculation steps:
[( 528 - 850 ) ÷ 850] x 100 = -37.88%
Formula
Percentage change = [(528 - 850) / 850] x 100
Subtract the new number by the original number
528 - 850 = -322
-322 ÷ 850 = -0.3788235294117647
-0.3788235294117647 x 100 = -37.88%