203.01% is the change from 166 to 503
Calculation steps:
[( 503 - 166 ) ÷ 166] x 100 = 203.01%
Formula
Percentage change = [(503 - 166) / 166] x 100
Subtract the new number by the original number
503 - 166 = 337
337 ÷ 166 = 2.0301204819277108
2.0301204819277108 x 100 = 203.01%