A pet store buys dog toys for $13 per toy and sells them to desperate owners of labs for $20 per toy. Any toys that remain unsold at the end of the month are liquidated by putting them on sale for $2 per toy. However, if the pet store doesn't have enough toys and a desperate lab owner shows up to buy a toy but they have none to sell, the store incurs a loss of goodwill estimated to cost the store $6. Now suppose that the demand for dog toys is uniformly distributed between 100 and 200 units. How many units should the Pet Store purchase from their suppliers? Round your answer to the nearest integer value