let
x--------> the exercise machines prince before the reduction
y--------> the exercise machines prince after the reduction
we know that
y=$[tex]564[/tex]
[tex]y=x*[100-40]/100 \\ y=x*0.60 \\ x=y/0.60 \\ x=564/0.60 \\ x=940[/tex]
the answer is
$[tex]940[/tex]