A Software Company Sells Three Packages Package A Package B

A software company sells three packages, Package A, Package B, and Package C, which retail for $99, $199, and $299, respectively. Quantity discounts are given according to the following table:
QuantityDiscount
10 through 19 …………………20%
20 through 49………………… 30%
50 through 99 …………………40%
100 or more ……………………50%
Create an application that allows the user to enter the number of units sold for each software package. The application’s form should resemble Figure 4-37.
The application should calculate and display the order amounts and the grand total in a Label control. The Clear button must clear all text boxes and calculated labels. The Exit button must close the window.
Input validation: Make sure the number of units for each package is numeric, and is not negative.

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