In this exercise, you modify the program from Lab 6-2 in Chapter 6. If necessary, create...

In this exercise, you modify the program from Lab 6-2 in Chapter 6. If necessary, create a new project named Intermediate20 Project and save it in the Cpp7\Chap09 folder. Copy the instructions from the Lab6-2.cpp file into a source file named Intermediate20.cpp. (Alternatively, you can enter the instructions from Figure 6-37 into the Intermediate20.cpp file.) Change the filename in the first comment. Modify the program so that it uses a value-returning function to determine the commission. Save and then run the program. Test the program appropriately.

REFERENCE :FIGURE 6-37