64.29% is the change from 210 to 345
Calculation steps:
[( 345 - 210 ) ÷ 210] x 100 = 64.29%
Formula
Percentage change = [(345 - 210) / 210] x 100
Subtract the new number by the original number
345 - 210 = 135
135 ÷ 210 = 0.6428571428571429
0.6428571428571429 x 100 = 64.29%