Here's the problem

A cart loaded with bricks has a total mass of 24.9 kg and is pulled at constant speed by a rope. The rope is inclined at 21.8* degrees above the horizontal and the cart moves 13.9 m on a horizontal floor. The coefficient of kinetic friction between ground and cart is 0.549.

The acceleration of gravity is 9.8 m/s^2. What is the normal force exerted on the cart by the floor. Answer in units of N.

Ok this is what i did, i said n = mg. (which i could've swore is right -- since its in the book and the study guide book in like 5 different places). so i got n = 244.02 N. Tell me please -- am i finding the wrong thing? cuz n is normal force, correct?