345.3% is the change from 117 to 521
Calculation steps:
[( 521 - 117 ) ÷ 117] x 100 = 345.3%
Formula
Percentage change = [(521 - 117) / 117] x 100
Subtract the new number by the original number
521 - 117 = 404
404 ÷ 117 = 3.452991452991453
3.452991452991453 x 100 = 345.3%