Frustrated with his inability to make a living through honest channels, Lou sets up a deceptive weightloss scam. The trick is to make insecure customers believe that they can "think those extra pounds away" if they will only take a ride in a van that Lou claims to be "specially equipped to enhance mental-mass fluidity." The customer sits on a platform scale in the back of the van, and Lou drives off at a constant speed of 14 m/s. Lou then asks the customer to "think heavy" as he drives through the bottom of a dip in the road having a radius of curvature of 80 m. Sure enough, the scale's reading increases, until Lou says, "Now think light," and drives over the crest of a hill having a radius of curvature of 100 m. If the scale reads 800 N when the van is on level ground, what is the range of readings for the trip described here?