An Internet service provider offers three subscription packages to its customers, plus a discount for nonprofit organizations:
Package A: 10 hours of access for $9.95 per month. Additional hours are $2.00 per hour.
Package B: 20 hours of access for $14.95 per month. Additional hours are $1.00 per hour.
Package C: Unlimited access for $19.95 per month.
Nonprofit organizations: 20% discount on all packages.
The user should select the package the customer has purchased from a set of radio buttons and enter the number of hours used in a textbox. A check box captioned “Nonprofit organization” should appear on the form. The application should calculate and display the total amount due using a label control.
1. Input validation: The number of hours used in a month cannot exceed 744. You must use textbox’s Validating event to do the validation.
2. Turn in the form’s screenshots and the code.
the question is from attachment part 1.