275% is the change from 64 to 240
Calculation steps:
[( 240 - 64 ) ÷ 64] x 100 = 275%
Formula
Percentage change = [(240 - 64) / 64] x 100
Subtract the new number by the original number
240 - 64 = 176
176 ÷ 64 = 2.75
2.75 x 100 = 275%
Example