70% is the change from 320 to 544
Calculation steps:
[( 544 - 320 ) ÷ 320] x 100 = 70%
Formula
Percentage change = [(544 - 320) / 320] x 100
Subtract the new number by the original number
544 - 320 = 224
224 ÷ 320 = 0.7
0.7 x 100 = 70%
Example