642.86% is the change from 42 to 312
Calculation steps:
[( 312 - 42 ) ÷ 42] x 100 = 642.86%
Formula
Percentage change = [(312 - 42) / 42] x 100
Subtract the new number by the original number
312 - 42 = 270
270 ÷ 42 = 6.428571428571429
6.428571428571429 x 100 = 642.86%