377.98% is the change from 109 to 521
Calculation steps:
[( 521 - 109 ) ÷ 109] x 100 = 377.98%
Formula
Percentage change = [(521 - 109) / 109] x 100
Subtract the new number by the original number
521 - 109 = 412
412 ÷ 109 = 3.779816513761468
3.779816513761468 x 100 = 377.98%