No cost price is given hence its not possible to calculate the actual answer.But don't worry I will simplify the equation till end that you can get the answer in fractions of sec
Solution:-
Let the Cost price be x
Mark up percent=40%
Now
Mark up=
[tex]\\ \sf\longmapsto 40\%\:of\:x[/tex]
[tex]\\ \sf\longmapsto \dfrac{40}{100}\times x[/tex]
[tex]\\ \sf\longmapsto \dfrac{40x}{100}[/tex]
[tex]\\ \sf\longmapsto 0.04x[/tex]
Just multiply The CP by 0.04 to get the answer