-29.64% is the change from 938 to 660
Calculation steps:
[( 660 - 938 ) ÷ 938] x 100 = -29.64%
Formula
Percentage change = [(660 - 938) / 938] x 100
Subtract the new number by the original number
660 - 938 = -278
-278 ÷ 938 = -0.29637526652452023
-0.29637526652452023 x 100 = -29.64%