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Suppose that the price of Product A falls from $20 to $15. In response, the quantity demanded of A increases from 100 to 120 units. The quantity demanded for Product B increases from 200 to 300.

1. Calculate the arc cross-elasticity between Product B and Product A.

2. Is B a substitute or complement for A? Explain.

3. Does Product A follow the "law of demand"? Explain.

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