Calculating discounts

A bakery sells slices of bread for 3.49 euros each. A day old bread gets a discount of 60 percent. Write a program that asks the user for the number of day old loaves of bread they want to buy. Then your program should show the price of bread, the discount for being a day old and the total price. Each one of these amounts must be shown on their own line with a suitable label. Every values should be displayed using two decimal places, and decimal points in all numbers should line up when the user enters reasonable values.

You have to test your program to see if it works well.

>>> %Run 
    Enter the number of day old loaves: 45
    -------------------------
    Regular price:     157.05
    Discount:           94.23
    -------------------------
    Total:              62.82

>>> %Run 
    Enter the number of day old loaves: 0
    -------------------------
    Regular price:       0.00
    Discount:            0.00
    -------------------------
    Total:               0.00

>>> %Run 
    Enter the number of day old loaves: -4
    You cannot buy negative amounts of bread

Insist that the students test their programs by giving them example
test executions.