Case-Based Critical Thinking Questions Case 1 - BrainPower Tutoring
The owner of BrainPower Tutoring needs an application to calculate and print estimates to provide to potential clients for tutoring services. A tutoring session is a minimum of one hour, and the hourly rate varies based on the subject. The application should allow the owner to enter the client's name, subject, number of tutoring sessions, and hourly rate. The application will display the total fee and allow the owner to print the estimate. You should also provide the ability for the owner to clear the screen and exit the application.
Which of the following statements would calculate and display the total fee?
A) TotalFee.Text = Val(txtNumberSessions) * Val(txtRate)
B) TotalFee.Text = NumberSessions.Text * Rate.Text
C) lblTotalFee.Text = Val(txtNumberSessions.Text) * Val(txtRate.Text)
D) TotalFee = NumberSessions * Rate

Question

Quizplus · Accepted Answer

Option A is incorrect because it fails to include ".Text" after the textboxes.
Option B is incorrect because it fails to include "Val" before the variables.
Option D is incorrect because it does not use the ".Text" property, and C# requires the use of the "=" sign before the variable name. 
Option C is correct because it includes the ".Text" property and uses "Val" to convert the text entered into numbers before multiplying them to find the total fee.