For product 1, the demand function is q1 = 1600 - 5p1 - 5p2. Substituting p1 = $40 and p2 = $20, we get:
q1 = 1600 - 5*40 - 5*20 = 1600 - 200 - 100 = 1300
So, the quantity demanded for product 1 is 1300 units.
For product 2, the demand function is q2 = 1400 -
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