-7.98% is the change from 815 to 750
Calculation steps:
[( 750 - 815 ) ÷ 815] x 100 = -7.98%
Formula
Percentage change = [(750 - 815) / 815] x 100
Subtract the new number by the original number
750 - 815 = -65
-65 ÷ 815 = -0.07975460122699386
-0.07975460122699386 x 100 = -7.98%