148.1% is the change from 210 to 521
Calculation steps:
[( 521 - 210 ) ÷ 210] x 100 = 148.1%
Formula
Percentage change = [(521 - 210) / 210] x 100
Subtract the new number by the original number
521 - 210 = 311
311 ÷ 210 = 1.480952380952381
1.480952380952381 x 100 = 148.1%