64.1% is the change from 312 to 512
Calculation steps:
[( 512 - 312 ) ÷ 312] x 100 = 64.1%
Formula
Percentage change = [(512 - 312) / 312] x 100
Subtract the new number by the original number
512 - 312 = 200
200 ÷ 312 = 0.6410256410256411
0.6410256410256411 x 100 = 64.1%