open the Gross pay solution.sln file contained in the VB2017\chap08\Gross pay solution folder. the interface provides a text box for entering the number of hours an employs worked.it also provide a list box for selecting the employee's pay code.the btnCalc_Click procedure should display the gross pay using the number of hours worked and the pay rate corosponding to the selected cod.employees working more than 40 hours receive time and a half for the hours worked over 40.use a class -level array to store the pay rates.