1. Write a statement to declare a named constant for a sales tax rate of 7.5%. 2. Why is it a good practice to use named constants, as opposed to using literals? 3. Consult the documentation of the...

1. Write a statement to declare a named constant for a sales tax rate of 7.5%.

2. Why is it a good practice to use named constants, as opposed to using literals?

3. Consult the documentation of the Java Class Library for the Scanner class. What method would you like to use to read a string from a Scanner object?