650% is the change from 42 to 315
Calculation steps:
[( 315 - 42 ) ÷ 42] x 100 = 650%
Formula
Percentage change = [(315 - 42) / 42] x 100
Subtract the new number by the original number
315 - 42 = 273
273 ÷ 42 = 6.5
6.5 x 100 = 650%
Example