Please write a Python program to complete the following task: Suppose a company offers quantity discounts. If up to 1,000 units are purchased, the unit price is $10. If more than 1,000 but up to 5,000 units are purchased, the unit price is $9. If more than 5,000 units are purchased, the unit price is $7.50. Ask the user to enter the number of units they wish to purchase, determine the unit price associated with the order quantity, and compute the total cost of the order. Inform the user of the unit price and total cost of the order.