170% is the change from 240 to 648
Calculation steps:
[( 648 - 240 ) ÷ 240] x 100 = 170%
Formula
Percentage change = [(648 - 240) / 240] x 100
Subtract the new number by the original number
648 - 240 = 408
408 ÷ 240 = 1.7
1.7 x 100 = 170%
Example