69.9% is the change from 392 to 666
Calculation steps:
[( 666 - 392 ) ÷ 392] x 100 = 69.9%
Formula
Percentage change = [(666 - 392) / 392] x 100
Subtract the new number by the original number
666 - 392 = 274
274 ÷ 392 = 0.6989795918367347
0.6989795918367347 x 100 = 69.9%