Answer: Option 'b' is correct.
Explanation:
Since we have given the figure showing store's supply demand graph for lawn chairs.
Profit made by selling lawn chairs by the store = $800
Using the graph , we conclude that
Demand curve and supply curve intersect at (25,40)
Here, y- axis denotes the price of commodity.
x - axis denotes the quantity of commodity.
So, the possible valid price for them would be $ 40.
Hence, Option 'b' is correct.