-73.44% is the change from 64 to 17
Calculation steps:
[( 17 - 64 ) ÷ 64] x 100 = -73.44%
Formula
Percentage change = [(17 - 64) / 64] x 100
Subtract the new number by the original number
17 - 64 = -47
-47 ÷ 64 = -0.734375
-0.734375 x 100 = -73.44%
Example