105.13% is the change from 312 to 640
Calculation steps:
[( 640 - 312 ) ÷ 312] x 100 = 105.13%
Formula
Percentage change = [(640 - 312) / 312] x 100
Subtract the new number by the original number
640 - 312 = 328
328 ÷ 312 = 1.0512820512820513
1.0512820512820513 x 100 = 105.13%