70.92% is the change from 392 to 670
Calculation steps:
[( 670 - 392 ) ÷ 392] x 100 = 70.92%
Formula
Percentage change = [(670 - 392) / 392] x 100
Subtract the new number by the original number
670 - 392 = 278
278 ÷ 392 = 0.7091836734693877
0.7091836734693877 x 100 = 70.92%