Write a program in python to calculate:

=============================================================== Shipping Calculator =============================================================== Cost of items ordered: 49.99 Shipping cost: 7.95 Total cost: 57.94

Continue? (y/n): y =============================================================== Cost of items ordered: -65.50 You must enter a positive number. Please try again. Cost of items ordered: 65.50 Shipping cost: 9.95 Total cost: 75.45

Continue? (y/n): n =============================================================== Bye!

Specifications:

Use the following table to calculate shipping cost:

Cost of Items Shipping Cost < $30.00 $5.95 $30.00 - $49.99 $7.95 $50.00 - $74.99 $9.95 > $75.00 Free

If the user enters a number thats less than zero, display an error message and give the user a chance to enter the number again.