-15% is the change from 620 to 527
Calculation steps:
[( 527 - 620 ) ÷ 620] x 100 = -15%
Formula
Percentage change = [(527 - 620) / 620] x 100
Subtract the new number by the original number
527 - 620 = -93
-93 ÷ 620 = -0.15
-0.15 x 100 = -15%
Example