Castle Heights has a density of 18 fast food restaurants per 1900 people, which is 0.00947 restaurants per person, and this is less than the 0.01 threshold.
On the other hand, Silver Crest has 23 restaurants for 2000 people, which is 0.0115, and this is above the 0.01 cutoff. Therefore, Castle Heights is the town that meets the chain's policy.