Since, Fnet = Fn + Fg (or in this case, Fn + Fn)

Fnet = 15 units + 15 units
Fnet = 30 units

Therefore, the net force acting on the object is 30.

I hope I helped :)
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Thank you so much .. Can i have your number>?
i am not yet good in physics. thats why. can i asked u everytime . about physics?
yeah. sure anytime. and don't worry, you'll get better at it as time goes by.
.. heheh :D Yehey! thanjks ::D
30 unit Fnet=Fn+Fg