142.86% is the change from 210 to 510
Calculation steps:
[( 510 - 210 ) ÷ 210] x 100 = 142.86%
Formula
Percentage change = [(510 - 210) / 210] x 100
Subtract the new number by the original number
510 - 210 = 300
300 ÷ 210 = 1.4285714285714286
1.4285714285714286 x 100 = 142.86%