1. Repair Bill: Suppose automobile repair customers are billed at the rate of $35 per hour for labor. Also, suppose costs for parts and supplies are subjected to a 5% sales tax. Write a program to display a simplified bill. The customer's name, the number of hours of labor, and cost of parts and supplies should be entered into the program via text boxes. When a button is clicked, the customer's name and the three costs should be displayed in a list box, as shown in fig.
2. Write a program to make change for an amount of money from 0 through 99 cents input by the user. The output of the program should show the number of coins from each denomination used to make change. See fig
3. Nutrition: The American heart association suggests that at most 30% of the calories in our diet come from fat. Although food labels give the number of calories and the amount of fat per serving, they often do not give the percentage of calories from fat. This percentage can be calculated by multiplying the number of grams of fat in one serving by 9 and dividing that number by the total number of calories per serving. Write the program that requests the name, number of calories per serving and the grams of fat per serving as input, and tells whether the food meets the American heart association recommendation.
4. Write a program to analyze a car loan. The user should enter the amount of the loan, annual percentage rate of interest, and the duration of the loan in months. When the user clicks on the button, the information that was entered should be checked to make sure it is reasonable. If bad data have been supplied, the user should be so advised. Otherwise, the monthly payment and the total amount of interest paid should be displayed. The formula for the monthly payment is:
Monthly payment= p.rl - (l+r) -n
where p is the amount of the loan, r is the monthly interest rate (annual rate divided by 12) given as a number between 0 (for 0%) and 1(for 100%), and n is the duration of the loan in months. The formula for the total interest paid is
total interest= n . [monthly payment] - p
5. Restaurant bill: A fast food vendor sells pizza slices ($1.75), fries ($2.00) and soft drinks ($1.25). Write a program to compute a customer's bill. The program should request the quantity of each item ordered in a Sub procedure, calculate the total cost with a function procedure, and use Sub procedure to display an itemized bill.
6. Rule of 72: This rule is used to approximate the time required for prices to double due to inflation. If inflation rate is r%, then the rule of 72 estimates that prices will double in 72/r years. For instance, at an inflation rate of 6%, prices double in about 72/6 or 12 years. Write a program to test the accuracy of this rule. For each interest rate from 1% to 20%, the program should display the rounded value of 72/r and the actual number of years required for prices to double at an r% inflation rate. (assume prices increase at the end of each year).
