Table 3 Assume that Harry and Ron can switch between producing spells and producing potions at a constant rate. Quantity Produced in one day Spells Potions Harry 18 6 Ron 18 9 Refer to Table 3. At which of the following prices would both Harry and Ron gain from trade with each other? 15 spells for 10 potions 15 spells for 6 potions O 15 spells for 3 potions O Harry and Ron could not both gain from trade with each other at any price