Final answer:
The question does not provide enough information to determine the market quantity of oranges demanded per day.
Step-by-step explanation:
The market price of an orange is $0.90. To determine the market quantity of oranges demanded per day, we need to refer to the demand curve. Unfortunately, the question does not provide any information about the demand curve, which is essential for calculating the quantity demanded at a specific price. Therefore, we cannot answer the given question without additional information.