A delivery van of mass 2000kg travels around a flat circular curve of radius 50m. The van's track width (distance between left and right wheels) is 1.6m, and its center of mass is located 1.0m above the road surface. If the van travels at a constant speed of 15m/s, calculate the magnitude of the normal reaction force acting on the inner pair of wheels. (Take g=10m/s2)