$4.(20$ points total$)$ Using Arrays for Repetitive Computations

The SAS data set orders$\_$midyear is in the STA$3024$ subdirectory. The file contains monthly customer order data for the first half of the year. The Sales manager is considering a five$-$percent price decrease next year. She wants to see how such a discount would affect this year's income by applying it to the midyear data.

a$.(15$ points$)$ Use a DATA step to read orders$\_$midyears and create a new data set, discount$\_$sales, that reflects the five$-$percent discount.

Create an array, Mon, to access Month$1$ through Month$6$ using a SAS variable list construction $($Month$1-$Month$6).$

Use a DO loop to adjust each customer's monthly data by applying the five$-$percent discount.

b$.(5$ points$)$ Use a PROC PRINT step to display the resulting data set and verify your results. Use the DOLLAR. format for the monthly sales amounts.