88.57% is the change from 350 to 660
Calculation steps:
[( 660 - 350 ) ÷ 350] x 100 = 88.57%
Formula
Percentage change = [(660 - 350) / 350] x 100
Subtract the new number by the original number
660 - 350 = 310
310 ÷ 350 = 0.8857142857142857
0.8857142857142857 x 100 = 88.57%