-21.43% is the change from 700 to 550
Calculation steps:
[( 550 - 700 ) ÷ 700] x 100 = -21.43%
Formula
Percentage change = [(550 - 700) / 700] x 100
Subtract the new number by the original number
550 - 700 = -150
-150 ÷ 700 = -0.21428571428571427
-0.21428571428571427 x 100 = -21.43%