48.86% is the change from 350 to 521
Calculation steps:
[( 521 - 350 ) ÷ 350] x 100 = 48.86%
Formula
Percentage change = [(521 - 350) / 350] x 100
Subtract the new number by the original number
521 - 350 = 171
171 ÷ 350 = 0.48857142857142855
0.48857142857142855 x 100 = 48.86%