Hi Fireant!
Quote by Fireant
Hi thank you for responding!
The mass of the box is 10kg. So the normal force here would have to be mg...?

No, the
weight, W, is mg (98 N).
The
normal force, N, is the normal component of the
reaction force.
You find N by taking components in the normal direction (of N and W), and equating the sum to zero …
what do you get?