30% is the change from 550 to 715
Calculation steps:
[( 715 - 550 ) ÷ 550] x 100 = 30%
Formula
Percentage change = [(715 - 550) / 550] x 100
Subtract the new number by the original number
715 - 550 = 165
165 ÷ 550 = 0.3
0.3 x 100 = 30%
Example