-29% is the change from 938 to 666
Calculation steps:
[( 666 - 938 ) ÷ 938] x 100 = -29%
Formula
Percentage change = [(666 - 938) / 938] x 100
Subtract the new number by the original number
666 - 938 = -272
-272 ÷ 938 = -0.2899786780383795
-0.2899786780383795 x 100 = -29%