50.14% is the change from 347 to 521
Calculation steps:
[( 521 - 347 ) ÷ 347] x 100 = 50.14%
Formula
Percentage change = [(521 - 347) / 347] x 100
Subtract the new number by the original number
521 - 347 = 174
174 ÷ 347 = 0.5014409221902018
0.5014409221902018 x 100 = 50.14%