-31.43% is the change from 770 to 528
Calculation steps:
[( 528 - 770 ) ÷ 770] x 100 = -31.43%
Formula
Percentage change = [(528 - 770) / 770] x 100
Subtract the new number by the original number
528 - 770 = -242
-242 ÷ 770 = -0.3142857142857143
-0.3142857142857143 x 100 = -31.43%