257.14% is the change from 210 to 750
Calculation steps:
[( 750 - 210 ) ÷ 210] x 100 = 257.14%
Formula
Percentage change = [(750 - 210) / 210] x 100
Subtract the new number by the original number
750 - 210 = 540
540 ÷ 210 = 2.5714285714285716
2.5714285714285716 x 100 = 257.14%